共查询到20条相似文献,搜索用时 15 毫秒
1.
微量稀土钇对Cu-Cr-Zr合金时效性能的影响 总被引:1,自引:0,他引:1
研究了微量稀土钇对Cu-Cr-Zr合金时效后导电率和显微硬度的影响。结果表明:Cu-0.41Cr-0.10Zr合金在950℃固溶1 h后,在480℃时效2h能获得较高的显微硬度和导电率;时效前冷变形可加快第二相的析出,使其性能得到显著提高。固溶后经60%变形后于480℃时效1 h其显微硬度和导电率分别高达154.3HV和81.5%IACS,而固溶后直接时效时仅为110.2HV和65.2%IACS。微量稀土元素Y的加入,使Cu-0.39Cr-0.11Zr-0.041Y合金的显微硬度较Cu-0.41Cr-0.10Zr合金高9HV,而导电率略有降低。 相似文献
2.
Liu Yong Liu Ping Tian Baohong Li Wei 《中国稀土学报(英文版)》2005,23(4):I0009-I0009
The effect of RE (such as Ce, Y and mixed Ce + Y, etc) on ageing precipitate, characteristics and softening resistance of Cu-Cr-Zr alloys contact wire used in electrical railway were investigated in this paper. The results show that the tested Cu-Cr-Zr alloy with trace RE addition could attain higher microhardness and lower electrical conductivity to some extent after being soluted at 950 ℃ for 1 h and aged at 480 ℃. The precipitation process of secondary phase could be accelerated by cold working before ageing treatment which resulted in ageing hardening. Aged at 480 ℃ after 60% cold working, the values of electrical conductivity and microhardness improved significantly compared with that without deformation. The mixed RE (Ce + Y) improved the softening resistance substantially in these trace RE additions, which could increase the soften temperature by 45 ℃. 相似文献
3.
采用非真空熔炼的方法制备了Cu-Si-Ni和Cu-Si-Ni-Ce合金,通过显微硬度和电导率测试等方法,对这两种合金的性能进行了研究,并探讨了微量稀土Ce对Cu-Si-Ni合金性能的影响。结果表明,微量稀土Ce的加入,能够提高Cu-Si-Ni合金的显微硬度,改善合金的导电性能;并明显细化了Cu-Si-Ni合金的晶粒。 相似文献
4.
5.
Asthelighteststructuralmetalmaterial ,themostobviousadvantagesofmagnesiumalloyaretheirhighspecificstrengthandspecificstiffness ,superdampingcapacityandmachinability ,excellentelectromagneticshieldingandnon toxicity .Theincreasingattentionhasbeenpaidonthepracticalapplicationofmagne siumalloysastheenergysavingandenvironmentpro tectionarebecomingtheworldfocus .However ,somedisadvantagessuchasignitableandcombustibledur ingmeltingandcastingandtheirrelativelypoorprop ertiesatelevatedtemperaturelimit… 相似文献
6.
Influence of Rare Earth Elements on Microstructure and Mechanical Properties of Mg-Li Alloys 总被引:6,自引:1,他引:6
Mg-Li alloy , which is also called superlight al-loy ,has many advantages ,such as lowdensity ,highstiffness-to-weight ratio , superior strength-to-weightratio ,good deformation ability ,good damping ability ,and high energetic particle penetration resistance[1 ,2].These advantages provide promising applicationsintheaerospace , electronic industry , and military field[3].Mg-Li alloys ,such as LA141 , LA191 ,and LAZ933were developed and have been usedfor components insatellites and aircrafts… 相似文献
7.
稀土对Al-Mg-Si系合金结构和性能的影响 总被引:7,自引:0,他引:7
本文用XRD和SEM方法研究了稀土对Al-Mg-Si系合金微观结构的影响,同时还测定了这些合金的耐腐蚀及力学性能。结果表明,该体系的稀土铝合金中大约含0.10%稀土就可以细化组织,提高使用性能。具有很好的应用前景。 相似文献
8.
9.
10.
稀土在贵金属铂及其合金中的作用和应用 总被引:11,自引:0,他引:11
徐国富 《稀有金属与硬质合金》1993,(4):54-59
稀土添加在铂及其合金中,不仅有细化晶粒的变质作用,还有提高铂及其合金组织稳定性、强度和范性的作用。本文就以上方面对稀土在铂及其合金中的作用和应用情况进行了概述,并指出了扩大稀土在贵金属铂及其合金中应用的意义。 相似文献
11.
探讨了Ag,Sn,Mg,si,RE几种合金化元素对Cu-0.3%Cr-0.1%Zr合金力学性能和导电性能的影响.所有合金试样经940℃固溶处理1 h后淬火,冷拉拔至加工变形量为20%,分别在350,400,450,500和550℃时效处理3.5 h.测试结果表明,在400℃时效3.5 h时,含Ag合金的抗拉强度和电导率最高,分别高于其他合金10~70 MPa和1.5%~5.O%IACS.合金化元素提高合金强度的能力由大到小依次为Ag,Sn,Mg,RE,Si;而在提高电导率方面由强到弱则依次为Ag,RE,Mg,Sn,Si.含Si合金具有较低的伸长率,约为6.6%,而其他几种合金的伸长率相差不大,均在12%左右.采用TEM观察了Cu-0.3%Cr-0.1%Zr-0.1%Ag合金在400℃时效3.5 h的组织,发现两种析出相,选区电子衍射标定结果表明它们分别是Cr和Cu<,4>Zr.合金性能主要由析出相的尺寸、分布和数量决定,而不同合金化元素对Cu-Cr-Zr合金的强化机制以及时效后在基体中的存在状态是造成性能差异的主要原因. 相似文献
12.
稀土合金的金相样品制备及组织分析 总被引:1,自引:0,他引:1
徐国富 《稀有金属与硬质合金》2000,(2):26-29
以La-Co-Ni三元系和Nd-Cu、Gd-CU二元系为例,介绍了稀土合金相试样的制备步骤和原则,给出了用该方法制作的5La-73Co-22Ni、5La-89Co-6Ni、25.6La-34Co-40.4Ni、Nd-69Cu、Gd-12Cu等成分合金的金相照片,并进行了适当的分析。 相似文献
13.
14.
15.
本文研究高强(2090)和中强(8090)铝锂合金疲劳长裂纹扩展机制,并分别与普通高强(7075)和中型(2024)铝合金相对比,揭示了在Paris区和Ⅲ区的外韧化机制,同时,研究了微量稀土元素Ce对两种铝锂合金疲劳长裂纹扩展特性的影响。研究工作表明,2090和8090铝锂合金的名义疲劳长裂纹扩展抗力分别显著优于7075和2024合金,在近门槛值区归因于裂纹闭合效应,Ⅲ区归因于分层韧化效应,Paris区系因裂纹闭合效应与分层韧化效应的藕合。2090和8090合金的本征疲劳裂纹扩展抗力分别优于和劣于7075和2024合金,微量Ce可大幅度改善2090合金的本征疲劳裂纹扩展抗力,在8090合金中则产生有害的影响。 相似文献
16.
Cu-0.45Cr-0.2Zr-xLa (x = 0–0.48) alloys were prepared by vacuum casting. The effects of La addition and orientation on the microstructure and properties of the as-cast alloy were investigated by an optical microscope, a scanning electron microscope with an energy dispersive X-ray spectrometer, a tensile testing machine and an electrical conductivity tester. The result shows that the addition of La significantly refines the columnar grainsize and decreases the secondary dendrite arm spacing. Trace addition of La improves the room temperature ultimate tensile strength, elongation and electrical conductivity mainly by purifying during melting and casting. The ultimate tensile strength, elongation and electrical conductivity significantly decrease with the increase of La content due to formation of coarse particles and oxides, which severely harm the performance of the Cu-0.45Cr-0.2Zr-xLa alloys. The Cu-0.45Cr-0.2Zr-0.13La alloy possesses a good combination of room temperature ultimate tensile strength, elongation and electrical conductivity. In addition, room temperature ultimate tensile strength and electrical conductivity along transverse direction of the ingot are higher than that along longitudinal direction, which is mainly ascribed to different distribution of grain boundary and grain orientation. 相似文献
17.
通过电导率测试、拉伸试验、SEM、EDS、金相显微镜观察等手段,研究稀土元素铈、镧的添加量对Al-B电工圆杆组织和性能的影响。结果表明,当稀土元素铈、镧的添加含量分别为0.05%~0.30%、0.10%~0.35%时,Al-B电工圆杆具有良好的综合性能。 相似文献
18.
19.
研究了添加2#工业铈的1#工业用的金属锌板和不添加2#铈的1#工业纯锌板的冲压性能、耐蚀性及铸态硬度.试样经轧制和在室温条件下作拉力试验,取得常规条件下的屈强比σ0.2/σb、加工硬化指数n、塑性应变比γ、均匀延伸率εb和各向异性值△γ,找出稀土金属铈含量对1#金属锌的冲压性能、耐蚀性能的影响和铸造状态的硬度变化. 相似文献