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and pseudo-elasticity of YAG laser spot melted Ti-Ni shape memory alloy wires [J]. Materials Transactions, 2004, 45(4): 1070-1076. [7] QIU X M, LI M G, SUN D Q, LIU W H. Study on brazing of TiNi shape memory...] investigated the electrochemical behaviors of laser-welded Ti-50.6%Ni SMA and the base metal in 0.9% NaCl solution by electrochemical techniques such as corrosion potential measurement, linear......
with alloying elements substituting Ni sublattice 合金元素Ti,Mo,Ta,W和Re均为γ′形成元素,这些Ti,Mo,Ta,W和Re等γ′形成元素在Ni3Al中优先占据Al的亚点阵位置[9].本文作者计算了Ti,Mo,Ta,W和Re加入后形成的三元Ni3Al合金的(010)面反相畴界能,计算结果如表3所列.从表3中可以看出,优先占据Ni3Al 中Al亚...显比化学计量比Ni3Al的APBE高,说明三元化合物中W-Ni键,Re-Ni键,Ta-Ni键,Mo-Ni键与Ti-Ni键依次较化合物中Al-Ni键结合强度大.本研究计算了Ni75Al23.75Ti1.25的Ti及其第一近邻Ni和Al的电子态密度分布,如图2所示.从图2中可以看出,Ni原子d轨道与Ti原子d轨道的杂化程度比Ni原子d轨道与Al原子p轨道的杂化程度明显高,这表明化合物所形成的Ni-Ti......
of Ni to Ti is reduced to 0.14 on top surface of the NaOH-HCl treated NiTi sample. Thus, for the TC samples, one or two dense titania layers were coated so as to protect the alloy substrate... shows XPS Ni 2p, Ti 2p and O 1s spectra of the coating sample TC1+1. The Ni 2p spectrum is flat, indicating that the titania coating completely covered NiTi substrate. Titanium on the surface presents......
peak. Key words: Ti50Ni45Cu5 alloy; martensite transformation; cold deformation; annealing; internal friction TiNi合金具有良好的形状记忆效应和超弹性,较高的力学性能,优良的耐磨耐腐蚀性能和良好的阻尼特性,同时还具有较好的生物相容性[1].近年来,对于Ti-Ni形状记忆合金进行了大量研究....%Ni-5at.%Cu alloy ribbon containing Ti2Ni particles[J]. Materials Science and Engineering A, 2008, 483: 460-463. [9] Suo Z Y, Qiu K Q, Ti-Cu-Ni alloys with high strength and good plasticity[J]. Journal......
DOI: 10.11817/j.issn.1672-7207.2015.04.005 机械合金化法制备TiNi合金及其表征 刘珏,李婧,杨海林,阮建明 (中南大学 粉末冶金国家重点实验室,湖南 长沙 410083) 摘要:采用机械合金化技术,分别以Ti,Ni及Cu纯元素粉末制备Ti50Ni50合金及Ti50Ni45Cu5合金.利用X线衍射仪(XRD)分析球磨时间,球磨转速以及第3组元Cu的加入对粉末的组成,衍射峰强度和晶格常数变化率的影响,通过扫描电子显微镜(SEM)观察不同条件下粉末的形貌.研究结果表明:随着球磨时间的延长,Ti和Ni的衍射峰强度降低,峰逐渐宽化并向低角度发生偏移；球磨8 h后,获得最大的Ni的晶格常数变化率,并使得粉末粒径最大程度地降低；适当提高球磨转速有利于合金化的进行,400 r/min的球磨转速能够使得Ni最强峰的衍射强度最大限度地降低,粉末粒径降低幅度达65......
) LaCu3Fe4O12[37]和BiNiO3[38]的负热膨胀则源于温度引起的阳离子迁移；4) 锰氮化合物[39]及LaFe13-xMx(M为Si,Al等)金属间化合物[9]的负热膨胀效应源于磁容积效应.除上述四类材料以外,具有热弹性马氏体相变的材料,如Ni-Ti[40],Ni-Fe[41],Mn-Co-Ge基化合物[42]等,在马氏体相变过程中同样呈现出显著的负热膨胀效应.其中,Ni-Ti与Ni-Fe的负热...]. International Journal of Applied Electromagnetics and Mechanics, 2002, 12(1): 35-37. [28] 马 骁,祝 星,赵仲勋,曹姗姗,柯常波,张新平. 显微组织不均匀性对富Ti 含量Ti-Ni合金负热膨胀行为的影响[J]. 中国有色金属学报,2018,28(3): 446-456. MA Xiao, ZHU Xing, ZHAO Zhong......
Trans. Nonferrous Met. Soc. China 30(2020) 2143-2155 Microstructure and shear strength of γ-TiAl/GH536 joints brazed with Ti-Zr-Cu-Ni-Fe-Co-Mo filler alloy Li LI1,2, Wei ZHAO1, Zhi-xue FENG1, Jia... 2020 Abstract: The influence of brazing temperature and brazing time on the microstructure and shear strength of γ-TiAl/GH536 joints brazed with Ti-Zr-Cu-Ni-Fe-Co-Mo filler was investigated using SEM......
influences the Ti-Ni alloy practises [2]. To achieve an absolute safety for the biomedical application, therefore, replacing the Ni with high potential and biocompatible elements such as Ta or Nb is essential..., the antibacterial properties were improved by increasing the silver content as well as particle size [21, 22]. Furthermore, another study was reported that Ag incorporation to Ti-Ni alloy with grain sizes ranging......
力学性能.但同时空拔管材的成形过程十分复杂,属于弹塑性变形与接触非线性耦合的多重非线性问题,使得空拔管的理论研究十分困难.随着计算机技术的发展,基于有限元法的数值模拟在管材拉拔中得到广泛应用.KAZUNARI等[1]利用二维轴对称有限元法对Ti-Ni形状记忆合金管的空拔及短芯头拉拔进行研究,并分析了拉拔过程中管材的应力应变分布.TAKASHI等[2]采用数值模拟与实验方法对比研究了钢管空拉及带芯头...,且值为114.862 MPa,模拟结果表明正交实验分析对空拉铜管拉拔参数优化的有 效性. REFERENCES [1] KAZUNARI Y, MASAKI W, HIROSHI I. Drawing of Ni-Ti shape-memory-alloy fine tubes used in medical tests[J]. Journal of Materials......
. 1 实验 所用原材料为Ti粉(50 μm,纯度99.9%),Ni粉(61 μm,纯度99.9%)和造孔剂碳酸氢铵(NH4HCO3)粉末(250 μm,纯度99.99%).首先将Ti粉和Ni粉按摩尔比49.2?50.8进行配料并充分混合；然后分别加入质量分数为10%, 20%和30%的NH4HCO3 粉末混合3 h.然后将不同成分配比的混合粉末在常温下用100 MPa的压制力压制成... fabricated by three different processes[J]. Metall Mater Trans A, 2006, 37(3): 755-761. [8] YOSHIDA I, ONO T, ASAI M. Internal friction of Ti-Ni alloys[J]. Journal of Alloys and Compounds, 2000, 310(1/2......
