Y含量对Zr_(47-x)Cu_(46)Al_7Y_x合金非晶形成能力及力学性能的影响

采用高真空电弧熔炼喷射成形法制备Zr_(47_x)Cu_(46)Al_7Y_x(x=3~8)大块非晶合金。采用X射线衍射分析、差示扫描量热仪、扫描电子显微镜、压缩试验和硬度试验分别研究Y含量对合金的非晶形成能力、显微组织、断口形貌及力学性能的影响。结果表明:Y含量对合金系的非晶形成能力和力学性能有显著影响,4 at%~7 at%Y含量试样由完全非晶组织构成,其过冷液相区ΔT_x为56~71 K,约化玻璃转变温度T_(rg)为0.665~0.678,但在3 at%与8 at%Y含量试样非晶基体中出现了极少量结晶组织。大块非晶具有较好力学性能,其抗压强度为1803~1899 MPa,维氏硬度为5.22~5.39 GPa,且具有较强非晶形成能力的试样相应地具有较好的力学性能。大块非晶在压缩中以纯弹性变形方式发生脆性断裂,断口光滑平整,为典型脉络状花纹。     

Y、Gd、La和Ce对Zr(-Ti)-Cu-Ni-Al非晶形成能力和力学性能的影响

为了控制Zr(-Ti)-Cu-Ni-Al非晶合金中的O含量,进而改善其玻璃形成能力和力学性能,本研究基于稀土元素与O的强相互作用,向合金中添加Y、Gd、La和Ce等元素。使用铜模浇铸制备非晶合金,利用DSC、XRD和TEM对其非晶形成能力和微观结构进行分析,通过压缩试验和SEM对其力学性能及断裂方式进行表征。结果表明:Y的添加对合金的非晶形成能力具有较大的提升,在相对较低真空的气氛下,可制备出直径10mm以上的块体非晶,抗压缩断裂强度达1950 MPa。     

ZrCuAlSi大块非晶合金形成及力学性能

通过铜模铸造法制备(Zr47Cu44Al9)100-xSix(x=0,0.5,1.5,2.5)大块非晶合金.利用差热分析、X射线衍射、显微硬度和室温压缩试验.研究分析添加Si元素对Zr47Cu44Al9合金非晶形成能力、热稳定性及力学性能的影响.结果表明,适量Si的加入能显著提高非晶合金的热稳定性,当Si的加入量为1.5时,合金具有最大的非晶形成能力,其纯非晶试样的临界尺寸由Zr47Cu44Al9的4 mm增大到(Zr47Cu44Al9)98.5Si1.5的6 mm.Si提高非晶形成能力的原因主要是抑制了引起异质形核的CuZr相的形成与析出.力学性能实验显示,显微硬度(Hv)随Si的加入由Zr47Cu44Al9合金的5850MPa增呔到(Zr47Cu44Al9)98.5Si1.5合金的6220 MPa,(Zr47Cu44Al9)98.5Si1.5合金的断裂强度为1862 MPa.     

硅烷流量对钛合金双极板表面改性碳膜性能的影响

目的通过对钛合金基底进行表面改性,提高其作为质子交换膜燃料电池(PEMFC)金属双极板的耐蚀导电性能。方法通过等离子体增强化学气相沉积法(PECVD),调控不同的Si H4流量(0～10 mL/min),在钛基底表面制备了含硅非晶碳膜。利用电化学工作站、界面接触电阻测量仪、水接触角测量仪、纳米压痕仪,分别测试了薄膜的耐蚀性、导电性、疏水性和力学性能。通过拉曼光谱分析了腐蚀前后薄膜内部杂化比变化,并结合扫描电子显微镜和高分辨透射电子显微镜研究了薄膜厚度、腐蚀形貌和内部结构。结果 SiH4流量为8m L/min时,制备的含硅非晶碳膜具有最佳耐蚀性和导电性,该含硅非晶碳膜水接触角为102.91°,硬度为9.28 GPa,弹性模量为60.34 GPa,厚度为2.822μm。其动电位腐蚀电流密度为0.017μA/cm2,相比钛基底提升3个数量级(80.51μA/cm~2),在1.4 MPa压力下,其界面接触电阻为47.06 mΩ·cm~2。结论硅的引入诱导非晶碳膜生成类石墨烯结构,提高了非晶碳膜的导电性能和耐蚀性能,提升了薄膜的力学性能及疏水性。用含硅非晶碳膜对钛双极板进行表面改性,有望显著提高极板的燃料电池性能。     

B元素的添加对Zr基合金非晶形成能力和力学性能的影响

在水冷铜坩埚中采用铜模吸铸法制备直径为3mm的(Zr71Fe14Cu15)100-xBx(x=1、23、、4、5)合金圆棒。采用X射线衍射(XRD)和准静态压力试验对Zr基合金的非晶形成能力力学性能进行研究。结果表明,当x=3时,非晶的形成能力最好;随着B元素含量的增加(x=1、2、3、4、5),淬火态合金呈现先减小后增大的趋势,当x=5时淬火态合金的断裂强度σmax和弹性模量最大(σmax=1398MPa,E=271GPa)。     

加入Ni基非晶带的TWIP钢激光焊接头组织及力学性能研究

采用激光焊对Fe-Mn-C-Al系TWIP钢进行不加非晶带和加入Ni基非晶带2种方法焊接,对2种方式下的焊接接头组织和力学性能进行了分析。结果表明:TWIP钢焊接接头结合良好,无裂纹等明显缺陷,添加Ni基非晶的焊缝处晶粒比未加非晶带焊缝处晶粒更加细小; 2种方法焊缝处的硬度均高于母材,添加非晶带的焊缝处硬度高于未添加非晶带的焊缝;在拉伸过程中,母材的抗拉强度为1 007 MPa,未加Ni基非晶的焊接试样抗拉强度为1 015 MPa,在焊缝处断裂,而添加非晶带的焊接试样抗拉强度为1 038 MPa,均高于母材和未加非晶带的焊接试样,拉伸时在母材处断裂。     

Cu47Ti33Zr11Ni8Si块体非晶合金的制备与力学性能

采用差压铸造法制备了Cu47Ti33Zr11Ni8Si块体非晶合金试样，测定了试样的三点弯曲强度。结果表明，该块体非晶合金具有极佳的力学性能，其弯曲断裂强度高达3260MPa，断裂前弹性变形量为2．7％，弯曲模量为101GPa。     

SLM成型316L体心立方点阵结构力学性能优化

为获得选区激光熔化成型力学性能更为优异的体心立方点阵结构模型，综合考虑多种结构参数的交互作用，通过响应曲面法分析了单胞杆径、杆长和杆倾斜角度等结构参数对点阵结构力学性能的影响。建立了结构参数与抗压强度及弹性模量关系的数学模型，进而优化得到最佳结构参数并进行试验验证。结果表明，单胞杆径对力学性能影响最大，随着单胞杆径的增大，点阵结构抗压强度与弹性模量增大，抗压强度最大为241.86 MPa,弹性模量最大为4.384 GPa。优化得到最佳结构参数为杆径Φ1.5 mm、杆长3 mm、杆倾斜角度60°,测得抗压强度为341.129 MPa,弹性模量为5.535 GPa,与优化前相比，抗压强度提高了41.044%,弹性模量提高了26.255%。与预测值相比，抗压强度与弹性模量的误差分别为2.194%和3.082%,两者相差很小，力学性能得到一定的提升。     

高速电弧喷涂FeNiCrBSiNbW非晶涂层组织结构与力学性能对热处理温度的响应∗

Fe 基非晶涂层因较高的性价比、良好的耐蚀性而广泛应用于众多工业领域,但其在高温环境下的使役性能会因微观结构的变化而发生改变。 为了探讨 Fe 基非晶涂层组织结构与力学性能对热处理温度的响应,利用高速电弧喷涂技术制备 FeNiCrBSiNbW 非晶涂层,随后对其进行不同温度热处理,获得三种具有不同组织结构的涂层。 采用 X 射线衍射仪、扫描电子显微镜、能谱仪、差示扫描量热仪、电子万能试验机、显微硬度计、纳米压痕仪对不同热处理温度下涂层的组织结构和力学性能进行表征。 结果表明:FeNiCrBSiNbW 涂层中非晶相的晶化过程包括初晶晶化与共晶晶化;随着热处理温度的升高,涂层的非晶相含量、孔隙率、结合强度与断裂韧性逐渐降低,而涂层的硬度与弹性模量不断增大。 研究成果对调控高速电弧喷涂 Fe 基非晶涂层的组织结构与力学性能有一定的指导意义。     

Co元素对Ti-Zr-Be-Cu块体非晶合金力学性能的影响

采用铜模铸造法制备了Ti35Zr30Be27.5-xCu7.5Cox(x=0,3.5,7.5,11.5)系列块体非晶合金。采用X射线衍射仪(XRD)、万能试验机和扫描电镜(SEM)研究了Co元素添加对Ti-Zr基非晶合金力学性能的影响。结果表明,Co元素适量替代Be元素有利于提高该非晶合金的塑性。当Co含量(摩尔分数)为3.5%时,Ti35Zr30Be24Cu7.5Co3.5块体非晶合金具有最高的断裂强度及塑性应变,分别为2 196MPa和4%;Co含量为7.5%时,非晶合金断裂强度、塑性应变均迅速降低,分别为2 062 MPa和1.5%;进一步增加Co含量至11.5%时,合金的断裂强度又提高到2 106 MPa,而塑性应变仅为0.2%。     

Microstructure and mechanical properties of Ti–Nb–Fe–Zr alloys with high strength and low elastic modulus

Zr was added to Ti–Nb–Fe alloys to develop low elastic modulus and high strength β-Ti alloys for biomedical applications. Ingots of Ti–12Nb–2Fe–(2, 4, 6, 8, 10)Zr (at.%) were prepared by arc melting and then subjected to homogenization, cold rolling, and solution treatments. The phases and microstructures of the alloys were analyzed by optical microscopy, X-ray diffraction, and transmission electron microscopy. The mechanical properties were measured by tensile tests. The results indicate that Zr and Fe cause a remarkable solid-solution strengthening effect on the alloys; thus, all the alloys show yield and ultimate tensile strengths higher than 510 MPa and 730 MPa, respectively. Zr plays a weak role in the deformation mechanism. Further, twinning occurs in all the deformed alloys and is beneficial to both strength and plasticity. Ti–12Nb–2Fe–(8, 10)Zr alloys with metastable β phases show low elastic modulus, high tensile strength, and good plasticity and are suitable candidate materials for biomedical implants.     

激光增材制造Ti64.51Fe26.40Zr5.86Sn2.93Y0.30生物医用合金的显微组织与性能(英文)

从生物力学和成形技术的角度出发,利用"团簇+连接原子"结构模型设计Ti-Fe-Zr-Sn-Y共晶合金,并利用激光增材制造技术在纯钛板上制备该合金的成形体。利用显微硬度计、压缩试验机、纳米压痕仪分别测试合金的硬度、压缩性能及弹性模量。结果表明,合金的硬度、压缩强度和断裂应变分别高达HV (788±10)、2229 MPa和14%,弹性模量则低至87.5 GPa。合金还具有良好的摩擦磨损性能、耐蚀性、成形性及生物相容性。合金的综合性能优于Ti_70.5Fe_29.5共晶合金和商用Ti-6Al-4V合金。该合金的上述性能使其成为一种很有前途的激光增材制造生物材料。     

Nanostructured bulk glassy Cu_(60)Zr_(30)Ti_(10) alloy with high strength and good ductility in cast state

1　INTRODUCTIONSinceaseriesofmetallicbulkglassyalloyswithexpectedmechanicalpropertiesandhighglassformingabilityhavebeenfound[13] ,particularattemptshavebeendonetoimprovethemechanicalpropertiesoftheglassyalloystomeetengineeringapplications .Bycrystallizingthemetallicglasses ,nanostructuredal loyscontainingnanocrystallinephasesandglassyma trixwereobtainedandthemechanicalpropertiesofthealloyswereenhancedbyhomogeneousdispersionofnanoscalemetallic particlesintheAl [4 ,5] ,Fe Ni [6 ] andMg [7]…     

Influence of Zr content on microstructure and mechanical properties of implant Ti–35Nb–4Sn–6Mo–xZr alloys

The influence of Zr content on the microstructure and mechanical properties of implant Ti–35Nb–4Sn–6Mo–xZr (x=0, 3, 6, 9, 12, 15; mass fraction) alloys was investigated. It is shown that Ti–35Nb–4Sn–6Mo–xZr alloys appear to have equiaxed single β microstructure after solution treatment at 1023 K. It is found that the grains are refined first and then coarsened with the increase of Zr content. It is also found that Zr element added to titanium alloys has both the solution strengthening and fine-grain strengthening effect, and affects the lattice parameters. With increasing the Zr content of the alloys, the strength increases, the elongation decreases, whereas the elastic modulus firstly increases and then decreases. The mechanical properties of Ti–35Nb–4Sn–6Mo–9Zr alloy are as follows: σ_b=785 MPa, δ=11%, E=68 GPa, which is more suitable for acting as human implant materials compared to the traditional implant Ti–6Al–4V alloy.     

Development of High Strength Ni–Cu–Zr–Ti–Si–Sn In-Situ Bulk Metallic Glass Composites Reinforced by Hard B2 Phase

In the present study, the influence of atomic ratio of Zr to Ti on the microstructure and mechanical properties of Ni–Cu–Zr–Ti–Si–Sn alloys is investigated. The alloys were designed by fine replacement of Ti for Zr from Ni₃₉Cu₂₀Zr_36?xTi_xSi₂Sn₃. The increase of Ti content enhances glass forming ability of the alloy by suppression of formation of (Ni, Cu)₁₀(Zr, Ti)₇ phase during solidification. With further increasing Ti content up to 24 at.%, the B2 phase is introduced in the amorphous matrix with a small amount of B19′ phase from alloy melt. The bulk metallic glass composite containing B2 phase with a volume fraction of ~ 10 vol% exhibits higher fracture strength (~ 2.5 GPa) than that of monolithic bulk metallic glass (~ 2.3 GPa). This improvement is associated to the individual mechanical characteristics of the B2 phase and amorphous matrix. The B2 phase exhibits higher hardness and modulus than those of amorphous matrix as well as effective stress accommodation up to the higher stress level than the yield strength of amorphous matrix. The large stress accommodation capacity of the hard B2 phase plays an important factor to improve the mechanical properties of in situ Ni-based bulk metallic glass composites.     

不同元素掺杂对Zr基非晶形成能力及力学性能的影响

在水冷铜坩埚中采用铜模吸铸法制备成直径为3 mm的Zr63Cu17.5Ni10Al7.5TM2(TM=Y,Fe,Ti)合金圆棒.通过X射线衍射(XRD)、差热分析(DSC)、力学性能及断口扫描(SEM)检测,结果表明Y、Fe、Ti元素微量掺杂可以得到完全非晶,Fe、Ti元素掺杂的试样具有较高的非晶形成能力和热稳定性(△...     

添加剂对低压烧结Zr50Al15Ni10Cu25非晶态粉末力学性能的影响

以商业纯元素粉末为原料,用机械合金化方法在低真空条件下合成了以非晶态为主的Zr50Al15Ni10Cu25粉末。研究了一定量的外界添加剂C、Si3N4和SiC对体系热稳定性和晶化行为的影响。混合粉末用手工预压成形,然后在氩气氛下进行低压烧结。利用X射线衍射（XRD）、扫描电镜（SEM）、差热分析（DSC）和电子拉伸实验机对粉末样和块状样进行了测试。结果表明,合适的外界添加剂可以提高体系的析晶活化能,增强体系的热稳定性。适量的Si3N4能促进Zr50Al15Ni10Cu25非晶粉末的低压烧结性能,即有助于提高样品的烧结致密度和样品的抗弯强度。     

Cu,Fe元素含量对喷射成形Al_(98-3x)Cu_(2x)Fe_xNi_1Ce_(0.5)Zr_(0.5)合金组织和性能的影响

采用喷射成形技术制备了不同成分的Ａｌ９８ － ３ ｘＣｕ２ ｘＦｅｘＮｉ１Ｃｅ０ ．５Ｚｒ０ ．５（ 摩尔分数, ％ ） 合金快速凝固材料。重点研究了Ｃｕ , Ｆｅ 元素含量对合金微观组织、力学性能以及断裂机制的影响。研究结果表明, ｘ ＜ ２ 时, 可有效避免粗大的Ａｌ７Ｃｕ２Ｆｅ 平衡相形成; ｘ ＝ １ ．５ 时, 合金具有较好的综合力学性能,合金的抗拉强度、屈服强度、延伸率和弹性模量分别可达６４３ ＭＰａ ,５５８ ．４ ＭＰａ ,８ ．４ ％ 和８０ ．４ ＧＰａ 。     

铜模吸铸法制备的Fe74Al4Sn2P10Si4B4C2非晶合金圆棒及圆管块体

利用铜模吸铸法制备了直径1．0mm,1．5mm和2．0mm的Fe74Al4Sn2P10Si4B4C2块体非晶合金圆棒,利用振动样品磁强计测试了圆棒的磁性能,其饱和磁感应强度较高,矫顽力较低。利用铜模吸铸法制备了Ф5mm×庐7mm×15mm的Fe74Al4Sn2P10Si4B4C2块体非晶合金圆管,并测试了其DSC曲线,块体非晶合金圆管与块体非晶合金圆棒的热性质一致。Fe74Al4Sn2P10Si4B4C2块体非晶合金显示出优良的铸造性能。     

Effects of cold deformation on microstructure and mechanical properties of Ti–35Nb–2Zr–0.3O alloy for biomedical applications

The Ti–35Nb–2Zr–0.3O (mass fraction, %) alloy was melted under a high-purity argon atmosphere in a high vacuum non-consumable arc melting furnace, followed by cold deformation. The effects of cold deformation process on microstructure and mechanical properties were investigated using the OM, XRD, TEM, Vicker hardness tester and universal material testing machine. Results indicated that the alloy showed multiple plastic deformation mechanisms, including stress-induced α” martensite (SIM α”) transformation, dislocation slipping and deformation twins. With the increase of cold deformation reduction, the tensile strength and hardness increased owing to the increase of dislocation density and grain refinement, and the elastic modulus slightly increased owing to the increase of SIM α” phase. The 90% cold deformed alloy exhibited a great potential to become a new candidate for biomedical applications since it possessed low elastic modulus (56.2 GPa), high tensile strength (1260 MPa) and high strength-to-modulus ratio (22.4×10^?3), which are superior than those of Ti–6Al–4V alloy.