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1.
J. L. Wang L. B. Liu X. D. Zhang X. Wang W. M. Bai 《Journal of Phase Equilibria and Diffusion》2014,35(3):262-268
The phase equilibrium of the Ti-Ta-Sn ternary system at 1173 K was investigated experimentally using x-ray diffraction, scanning electron microscopy, and electron probe microanalysis. The isothermal section on the whole composition range was constructed, where eight single-phase regions and seven three-phase regions coexisted. The ternary compound Ti36Ta28Sn36 was found in the experiment, and two three-phase regions β-Ti6Sn5 + Ti36Ta28Sn36 + Ta3Sn and Ti2Sn + Ti3Sn + β(Ti, Ta) were experimentally detected. Experimental analysis shows that the solid solution β(Ti, Ta) dissolves up to approximately 21.2 at.% Sn, and that the maximum solubility of Ta in Ti3Sn and Ti5Sn3 can reach up to 9.3 and 5.9 at.%, respectively. The solubility values of Ta in Ti2Sn and β-Ti6Sn5 are no less than 7.3 and 15.5 at.%, respectively, whereas that of Ti in Ta3Sn is no less than 8.8 at.%. The liquid phase mainly exists in the Sn-rich corner. 相似文献
2.
Huaqing Zhang Cong Zhang Peng Zhou Yong Du Yingbiao Peng Shuhong Liu Jiong Wang Kun Li 《Journal of Phase Equilibria and Diffusion》2018,39(6):789-799
In this work, the phase diagrams of the Mo–Ti–Zr ternary system were determined by means of X-ray diffraction, optical microscopy, and electron probe microanalysis. Two isothermal sections of the Mo–Ti–Zr ternary system at 900 and 1100 °C were experimentally established. There are three two-phase regions and one three-phase region at both isothermal sections. The existence of the three-phase region (β1?+?Laves?+?β2) at 900 and 1100 °C indicates that the β phase (bcc solid solution) separates into two phases, i.e. Mo, Ti rich solid solution β1 and Ti, Zr rich solid solution β2. No ternary compounds were detected. The maximum solubilities of Ti in the Laves phase were found to be 19.3 at.% at 900 °C and 18.3 at.% at 1100 °C, respectively. The liquidus projection and reaction scheme of the Mo–Ti–Zr system were also presented based on the present experimental work and literature information. 相似文献
3.
Juliano Soyama Michael Oehring Thomas Ebel Karl Ulrich Kainer Florian Pyczak 《JOM Journal of the Minerals, Metals and Materials Society》2017,69(4):676-682
The sintering behavior of metal injection molded titanium aluminide alloys, their microstructure formation and resulting mechanical properties were investigated. As reference material, the alloy Ti-45Al-5Nb-0.2B-0.2C at.% (TNB-V5) was selected. Additionally, two other variations with Mo and Mo + Si additions were prepared: Ti-45Al-3Nb-1Mo-0.2B-0.2C at.% and Ti-45Al-3Nb-1Mo-1Si-0.2B-0.2C at.%. The results indicate that the optimum sintering temperature was slightly above the solidus line. With proper sintering parameters, very low porosities (<0.5%) and fine microstructures with a colony size <85 µm could be achieved. Considering the sintering temperatures applied, the phase transformations upon cooling could be described as L + β → β → α + β → α → α + γ → α2 + γ, which was in agreement with the microstructures observed. The effects of Mo and Si were opposite regarding the sintering behavior. Mo addition led to an increase in the optimum sintering temperature, whereas Si caused a significant decrease. 相似文献
4.
Fucheng Yin Caixia Wu Zhi Li Manxiu Zhao Yongxiong Liu 《Journal of Phase Equilibria and Diffusion》2013,34(3):181-187
The 900 °C isothermal sections of the Fe-Cr-Ni-Al quaternary with Fe fixed at 70 at.% and that with Ni fixed at 60 at.% have been determined by scanning electron microcopy coupled with energy dispersive spectroscopy and x-ray diffraction. Only one three-phase region marked as α-Fe + β-(Fe,Ni)Al + γ-Fe has been found in the 70Fe-Cr-Ni-Al section. With regard to the Fe-Cr-60Ni-Al section, there are three three-phase regions, i.e., α-Cr + γ-Ni + γ′-Ni3Al, γ-Ni + γ′-Ni3Al + β-(Fe,Ni)Al and α-Cr + β-(Fe,Ni)Al + γ′-Ni3Al and one four-phase region, namely α-Cr + β-(Fe,Ni)Al + γ-Ni + γ′-Ni3Al. No quaternary compound is found in the present work. 相似文献
5.
The microstructural evolution of a novel β-type Ti–6Mo–6V–5Cr–3Sn–2.5Zr (wt%) alloy subjected to different aging treatments was investigated. The normalized intensity of the α precipitates reached a peak value at 450 °C. A nanoscale orthorhombic phase was observed to coexist with α precipitates in the β matrix, which followed the Burgers orientation relation of 〈\(1120\)〉α//〈111〉β and {0001}α//{110}β. Fine α precipitates were formed with metastable O and β′ phases, and the β phase was spinodally decomposed to β and β′ phases. The maximum hardness value of the specimen was obtained after aging at 450 °C. Compositional partitioning of Mo, V, and Cr elements occurred with the depletion of fine acicular α precipitates upon aging 450 °C. 相似文献
6.
Lin Li Libin Liu Ligang Zhang Lijun Zeng Yun Zhao Weimin Bai Yurong Jiang 《Journal of Phase Equilibria and Diffusion》2018,39(5):549-561
1000, 1100 and 1150 °C isothermal sections of the Ti-Al-Nb system were studied using x-ray diffraction, scanning electron microscopy and electron probe microanalysis. A small island-like region of single β0 is present at 1000, but absent at 1100 and 1150 °C. γ1 is not a stable phase at 1000 and 1150 °C. Three three-phase fields (α2?+?β0?+?σ, β0?+?σ?+?γ and α2?+?β0?+?γ) are identified in the 1000 °C isothermal section (30-60 at.% Ti content). The 1100 °C isothermal section is firstly studied completely. It includes six three-phase and thirteen two-phase fields. Two three-phase fields β?+?α2?+?γ and β?+?σ?+?γ are identified in the isothermal section (30-60 at.% Ti content) at 1150 °C. These data are helpful to the fabrication of the TiAl and Ti2AlNb intermetallics. 相似文献
7.
Hongyi Guo Yueyan Tian Shuaixiong Huang Weiming Bai Mingyue Tan Lin Li Libin Liu Ligang Zhang 《Journal of Phase Equilibria and Diffusion》2018,39(3):344-355
Phase relations in the Ti–V–Sn system are of great importance for design of aerospace titanium alloys. However, reported Ti–V–Sn ternary phase diagrams present great differences. The isothermal section of the Ti–V side in the Ti–V–Sn system at 1073, 1173, and 1273 K was established using equilibria alloys. There are 11 two-phase equilibria and 3 three-phase equilibria, 9 two-phase equilibria and 3 three-phase equilibria, and 9 two-phase equilibria and 3 three-phase equilibria in the isothermal section at 1073, 1173, and 1273 K, respectively. In addition, remarkable ternary solubility in some binary compounds was detected, e.g., up to 21.18 and 22.23 at.% V in Ti3Sn and Ti2Sn, respectively, at 1273 K. 相似文献
8.
Ya Liu Bin Zhou Changjun Wu Haoping Peng Jianhua Wang Xuping Su 《Journal of Phase Equilibria and Diffusion》2018,39(3):280-289
Phase relationships in the Fe-Mn-Sn ternary system at 723 K were investigated using equilibrated approach. More than 40 alloys were prepared by arc-melting method and examined by x-ray powder diffraction, scanning electron microscopy and energy dispersive spectroscopic. The existence of five binary compounds FeSn, FeSn2, MnSn2, Mn3Sn2, Mn3Sn and one intermediate solid solution γ(Fe, Mn) have been confirmed in this system. FeSn2 and MnSn2 form continuous solid solution (Fe1?x, Mn x )Sn2 (0 ≤ X ≤ 1) and the lattice parameters of (Fe, Mn)Sn2 reduced linearly with increasing of Fe content. At 723 K, the maximum solid solubilities of Fe in αMn, βMn, Mn3Sn, Mn3Sn2 phases and Mn in FeSn, αFe are about 25, 34.8, 37.3, 46.2 at.% Fe and 26.8, 5.5 at.% Mn respectively. The solid solubilities of γ(Fe, Mn) ranged from 42.1 to 78.1 at.% Fe and the limited solubility of Sn is around 3 at.%. The isothermal section consists of 6 three-phase regions, 13 two-phase regions and 9 single-phase regions. No ternary compound was found at 723 K in this system. 相似文献
9.
Haoping Peng Shouwu Xu Jianhua Wang Changjun Wu Hao Tu Xuping Su 《Journal of Phase Equilibria and Diffusion》2017,38(2):151-159
The 600 °C isothermal section of the Al-Ni-Zn ternary system was constructed based on wave dispersive x-ray spectrometry and x-ray power diffraction analysis. Eight three-phase regions have been identified in the Al-Ni-Zn ternary system at 600 °C. No new ternary compound was found in the system. The Liq. phase (η-Zn) can be in state of equilibrium with the Al3Ni, Al3Ni2 and AlNi phases. The solubility of Ni in the Liq. phase is low, no more than 0.8 at.%. Binary phases AlNi and NiZn extend into the ternary system, and they co-exist in the Al-Ni-Zn ternary system at 600 °C. The three-phase triangles of (NiZn + AlNi + Ni3Zn14) and (AlNi3 + AlNi + NiZn) are constructed in this ternary system. As shown in this research result, the three-phase equilibrium relationship of the phases AlNi, Al3Ni5 and AlNi3 has been confirmed in the present study. 相似文献
10.
《Intermetallics》2007,15(2):148-153
The phase equilibria in the composition range from 0 to 60 at% Ga of the Ni–Ga system were determined by electron probe microanalysis (EPMA) using diffusion couples, differential scanning calorimetry (DSC) and X-ray diffraction (XRD). It was found that while the phase equilibria between the α′ (L12: Ni3Ga) and α (Ni-solid solution) or β (B2: NiGa) phases are basically in agreement with the diagram evaluated by Lee and Nash, those between γ (B81: Ni13Ga7), δ (Cmmm: Ni5Ga3) and ɛ (C2/m: Ni13Ga9) are topologically different from that diagram. Three eutectoid reactions (γ → δ + ɛ, β → γ + ɛ, β → α′ + γ) and one peritectoid reaction (α′ + γ → δ) were confirmed and the temperatures and concentrations of those invariant reactions were determined. 相似文献
11.
Chaoying Lin Cong Zhang Shimin Wang Peng Zhou Yong Du 《Journal of Phase Equilibria and Diffusion》2017,38(4):552-560
The isothermal section of the Co-Mo-Zr ternary system at 1100 °C was constructed experimentally. A series of phases including their crystal structures and compositions were obtained by examining the annealed specimens through x-ray diffraction (XRD), optical microscopy (OM), and electron probe microanalysis (EPMA). It was confirmed that two ternary phases, λ1 (Co0.5-1.5Mo1.5-0.5Zr, hP12-MgZn2) and ? (CoMo4Zr9, hP28-Hf9Mo4B), exist in the Co-Mo-Zr ternary system at 1100 °C. And the experimental results also indicated that there are fourteen three-phase regions at 1100 °C. Ten of them were well determined in the present work: (1) (γCo) + Co11Zr2 + Co23Zr6, (2) (γCo) + Co23Zr6 + θ-Co9Mo2, (3) Co23Zr6 + θ-Co9Mo2 + μ-Co7Mo6, (4) (Mo) + μ-Co7Mo6 + Co2Zr, (5) (Mo) + Co2Zr + λ1, (6) (Mo) + Mo2Zr + λ1, (7) λ1 + Mo2Zr + CoZr, (8) Co2Zr + CoZr + λ1, (9) Mo2Zr + CoZr + liquid and (10) ? + Mo2Zr + (βZr). The maximum solubilities of Zr in μ-Co7Mo6 phase, Mo in Co2Zr phase and Co in Mo2Zr phase were determined to be 5.89, 12.57 and 9.95 at.%, respectively. While the solubilities of Zr in θ-Co9Mo2 and (γCo) phases, Mo in Co11Zr2 and CoZr phases were detected to be extremely small. According to this work, the Co23Zr6 phase contained 21.61 at.% Mo and 8.32 at.% Zr. In addition, the maximum solubilities of Co and Zr in (Mo) phase and Mo in (γCo) phase were measured to be 3.61, 5.60 and 11.20 at.%, respectively. 相似文献
12.
E. M. Kadykalo L. P. Marushko I. A. Ivashchenko O. F. Zmiy I. D. Olekseyuk 《Journal of Phase Equilibria and Diffusion》2013,34(3):221-228
Phase equilibria in the quasi-ternary system Cu2Te-CdTe-In2Te3 were investigated by differential thermal and x-ray phase analyses methods. Five vertical sections CuInTe2-CdTe, ‘Cu1.5In0.5Te1.5’-CdTe, CuInTe2-CdIn2Te4, CuIn5Te8-CdTe, CuIn5Te8-CdIn2Te4 were constructed. System triangulation was performed, and the boundaries of six single-phase fields at 670 K were determined, which are the solid solution ranges of the components and the intermediate phases of the system. Liquidus surface projection was investigated, and we have identified a monovariant eutectic process L ? β + δ, and three nonvariant processes LU + η ? δ + ε, β + δ ? α + ζ, δ ? γ + ε + η at 965 K, 847 and 690 K, respectively, that take place in the system. 相似文献
13.
Various ternary elements were added to observe the effects on the microstructural features of β+γ′ two-phase alloys. The microstructural features of β+γ′ two-phase (Ni66Al34)100-χXχ(X=Ti, Si, Nb) depended on the As (austenite start) temperature of β-martensite with alloying elements. For As>250°C, a lamellar microstructure was found to form by the following phase transformation: Martensite→Ni5Al3→β+γ’. For As<250°C, two-type microstructures, mesh and Widmanstätten, were formed depending on the ternary element. When Ti or Nb was added as a ternary element, the β→Ni5Al3 transformation occurred very quickly. Conversely, this transformation proceeded very slowly in the case of Si addition, and the resultant microstructure assumed somewhat different features. Consequently, it could be suggested that the microstructures of NiAl/Ni3Al two-phase alloys are determined by not only the As temperature but also by the β→Ni5Al3 transformation. 相似文献
14.
Anmin Li Ding Ma Qifeng Zheng 《Journal of Materials Engineering and Performance》2014,23(4):1197-1203
A series of AlTiCr x FeCoNiCu (x: molar ratio, x = 0.5, 1.0, 1.5, 2.0, 2.5) high-entropy alloys (HEAs) were prepared by vacuum arc furnace. These alloys consist of α-phase, β-phase, and γ-phase. These phases are solid solutions. The structure of α-phase and γ-phase is face-centered cubic structure and that of β-phase is body-centered cubic (BCC) structure. There are four typical cast organizations in these alloys such as petal organization (α-phase), chrysanthemum organization (α-phase + β-phase), dendrite (β-phase), and inter-dendrite (γ-phase). The solidification mode of these alloys is affected by Chromium. If γ-phase is not considered, AlTiCr0.5FeCoNiCu and AlTiCrFeCoNiCu belong to hypoeutectic alloys; AlTiCr1.5FeCoNiCu, AlTiCr2.0FeCoNiCu, and AlTiCr2.5FeCoNiCu belong to hypereutectic alloys. The cast organizations of these alloys consist of pro-eutectic phase and eutectic structure (α + β). Compact eutectic structure and a certain amount of fine β-phase with uniform distribution are useful to improve the microhardness of the HEAs. More γ-phase and the microstructure with similar volume ratio values of α-phase and β-phase improve the compressive strength and toughness of these alloys. The compressive fracture of the series of AlTiCr x FeCoNiCu HEAs shows brittle characteristics, suggesting that these HEAs are brittle materials. 相似文献
15.
Zhi Li Conglai Liao Yongxiong Liu Xinming Wang Yu Wu Manxiu Zhao Zhaohui Long Fucheng Yin 《Journal of Phase Equilibria and Diffusion》2014,35(5):564-574
The 700 °C isothermal section of the Al-Ti-Si ternary phase diagram has been determined experimentally by means of scanning electron microscopy coupled with energy dispersive x-ray spectroscopy and x-ray powder diffraction. Fourteen three-phase regions have been determined experimentally in the isothermal section at 700 °C. The ternary phases τ1 (I41/amd, Zr3Al4Si5-type) and τ2 (Cmcm, ZrSi2-type) are confirmed in the system at 700 °C. The compositions of τ1 and τ2 are found as Al6.2-9.3Ti32.4-34.0Si57.5-60.9 and Al10.0-11.6Ti34.2-34.5Si53.9-55.6, respectively. The τ3 and Ti3Al5 phases are not found in the section. The Ti-rich corner at 700 °C shows the presence of three three-phase equilibriums, i.e., (TiAl + Ti3Al + Ti5Si3), (α-Ti + Ti3Si + Ti5Si3) and (α-Ti + Ti3Al + Ti5Si3). The maximum solubility of Al in Ti5Si3, Ti3Si and α-Ti is 6.0, 1.5 and 13.9 at.% at 700 °C, respectively. The maximum solubility of Si in L-Al, TiAl3, TiAl2, TiAl, Ti3Al and α-Ti is 24.1, 13.6, 1.5, 0.8, 2.3 and 2.3 at.%, respectively. 相似文献
16.
Shuo Wang Kun Ma Ya Liu Jianhua Wang Xuping Su 《Journal of Phase Equilibria and Diffusion》2017,38(6):906-915
The isothermal section of the Zn-Al-Mg-Si quaternary system at 450 °C with Zn fixed at 70 at.% has been determined by means of scanning electron microscopy, energy dispersive spectroscopy and x-ray diffraction. The results show that there exist the following equilibria regions in the isothermal section: Liq. + α-Al + MgZn2 + Mg2Si and Liq. + α-Al + Mg2Si + (Si) four-phase regions, and Liq. + α-Al + Mg2Si, Liq. + α-Al + MgZn2, Liq. + MgZn2 + Mg2Si, Liq. + α-Al + (Si) and Liq. + MgZn2 + (Si) three-phase regions. Si is almost insoluble in MgZn2 and α-Al. The maximum solubility of Al and Zn in Mg2Si is 1.8 and 6.1 at.%, respectively. The maximum solubility of Al and Si in MgZn2 is 3.2 and 0.5 at.%, respectively. No ternary and quaternary compounds were found in this study. 相似文献
17.
《Intermetallics》2005,13(6):655-661
The phase separation in the bcc phase of the Cu–Al–Ni system at 600–700 °C was investigated mainly by energy dispersion X-ray spectrometry (EDS) and differential scanning calorimetry (DSC). The compositions of the β1 (A2 or B2: Cu-rich), β2 (B2: NiAl-rich) and γ (γ-brass type) phases in equilibrium were determined. It was found that there is a β1+β2 miscibility gap in the β phase region as previously reported by Alexander. It was confirmed by means of high temperature in situ TEM observation that this miscibility gap consists of the B2+B2 phases but not the A2+B2 phases which is sometimes observed in many other Ni–Al and Co–Al base ternary bcc alloys. Thermodynamic calculation was performed which indicates that this characteristic feature suggests that the β1 (B2)+β2 (B2) miscibility gap is a part of a Cu-rich B2+NiAl-rich B2 miscibility gap island formed around the center of the composition triangle of the isothermal section. The phase separation in the β phase region and the stability of the ordered bcc aluminide are presented and discussed. 相似文献
18.
Elshat Kerimov Semyon Nikolaev Evgen Slyusarenko 《Journal of Phase Equilibria and Diffusion》2016,37(2):135-148
Phase equilibria in the quaternary Ni-Re-Nb-Cr system at 1375 K have been determined by using the graph method combined with equilibrated alloys that were characterized with electron probe microanalysis and x-ray diffraction techniques. Three 4-phase equilibria, α + βCr + λ + σ, α + βNb + λ + χ, and α + γ + σ + Re, and three nonprojected 3-phase equilibria, α + λ + χ, α + λ + σ and α + σ + χ, have been experimentally established. In addition, the graph method suggested the existence of the following four other 4-phase equilibria in this system at 1375 K, α + βCr + γ + σ, α + βNb + λ + μ, α + λ + σ + χ, and α + σ + χ + Re. 相似文献
19.
《Intermetallics》2007,15(5-6):625-631
Microsegregation in big ingots of Ti–45Al–(8–9)Nb–(W, B, Y) alloy had been studied. The composition and microstructural morphology of the large ingot exhibited significant microinhomogeneity. Three types of microsegregation were observed in as-cast microstructure of the large ingot. First is the solidification segregation (S-segregation) at interdendritic area, in which the composition is characterized by higher Al, B (boride), and Y (oxide) contents and lower Nb and W contents. Second is the β-segregation at the boundary and triple junctions among α grain due to the phase transformation of β → α. The composition at the segregation area is characterized by higher Nb and W additions that lead to the formation of β particles and γ phase. Third is the α-segregation that forms local lamellar structure composed of β, γ and α plates due to phase transformation of α → α2 + β + γ. The microsegregation for the PAM ingot is lower than that for SM ingot in terms of the volume fraction of β phase. The reason is that the PAM melting can offer better control of pouring temperature and rather fast cooling rate by water-cooled copper crucible. 相似文献
20.
GuangWei Zhao Chong Ding MingChun Gu 《International Journal of Cast Metals Research》2019,32(1):36-45
The influences of cooling rate and initial composition on solidification path, microstructure and hardness of Al-Cu-Si alloys were investigated. The results indicate that the solidification paths of alloys Al-3.7Cu-6.5Si, Al-5.2Cu-2.6Si and Al-15.1Cu-6.2Si were (L + α-Al)→(L + α-Al+ β-Si)→(L + α-Al+ β-Si+ θ-Al2Cu), and the solidification paths of alloys Al-4.6Cu-0.9Si, Al-24.2Cu-3.9Si and Al-26.9Cu-2.1Si were (L + α-Al)→(L + α-Al+ θ-Al2Cu)→(L + α-Al+ β-Si+ θ-Al2Cu). Furthermore, it is found that the further the initial compositions from the binary eutectic trough and the slower the cooling rate was, the second dendrite arm spacing was larger and the volume percent of phase θ-Al2Cu was fewer, and then influence the hardness. There were three kinds of (α-Al+ θ-Al2Cu) binary eutectic, two kinds of (α-Al+ β-Si+ θ-Al2Cu) ternary eutectic and one kind of (α-Al+ β-Si) binary eutectic morphologies existed in the solidification specimens. 相似文献