Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第6期    总第171期    2013年6月

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文章编号:1004-0609(2013)06-1560-07
Sn、Zr、Mo对Ti35Nb基合金组织与力学性能的影响
陈 锋,王 煜

(东南大学 材料科学与工程学院 江苏省先进金属材料高技术研究重点实验室,南京 211189)

摘 要: 根据钛合金相关设计理论,采用无细胞毒性的合金元素Nb、Sn、Zr和Mo设计具有低弹性模量的近β型Ti35Nb-Sn-Zr-Mo五元钛合金,研究Sn、Zr和Mo合金元素对合金显微组织与力学性能的影响。结果表明:所设计合金在800 ℃固溶后的组织均为单一β等轴晶组织;平均晶粒尺寸随着Sn与Zr含量的增加而减小,而随着Mo含量的增加先减小后增大。随着Sn、Zr和Mo合金元素的增加,合金强度随之升高,而伸长率逐渐下降,弹性模量随着Sn和Mo含量的增加而升高,而随着Zr含量的增加先下降后升高。固溶处理后,具有最高容许应变的合金为Ti35Nb2Sn6Zr3Mo,其抗拉强度、屈服强度、弹性模量以及伸长率分别为664 MPa、641 MPa、59 GPa以及12.5%。

 

关键字: 钛合金;Sn-Zr-Mo;钛合金设计理论;显微组织;力学性能

Influence of Sn, Zr and Mo elements on microstructure and mechanical properties of Ti35Nb based alloys
CHEN Feng, WANG Yu

Jiangsu Key Laboratory of Advanced Metallic Materials,
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

Abstract:Metastable β-type Ti35Nb-based alloys containing non-toxic elements Nb, Sn, Zr and Mo and with relative low elastic moduli, were designed based on the relative design theories of titanium alloys. The influence of Sn, Zr and Mo alloying elements on the microstructure and mechanical properties of the alloys was investigated. The results show that the designed alloys are all composed of single β phase after solid solution treatment at 800 ℃. The average grain sizes decrease with increasing Sn and Zr contents, while they decrease first and then increase with increasing Mo content. The strength of the alloys increases while the elongation decreases with increasing Sn, Zr and Mo contents. The elastic moduli of the alloys increase with increasing Sn and Mo contents, while they decrease first and then increase with increasing Zr content. The ultimate tensile strength, yield strength, elastic modulus and elongation of the Ti35Nb2Sn6Zr3Mo alloy with the highest allowable strain are 664 MPa, 641 MPa, 59 GPa and 12.5%, respectively.

 

Key words: titanium alloy; Sn-Zr-Mo; titanium alloy design theory; microstructure; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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