摘要
本试验采用冷等静压法及粉末冶金法制备钛合金,消除了成分偏析对合金性能的影响。在Ti-6Al-4V-2Cr中加入稀土Nd元素并进行热处理,运用光学显微镜、XRD和TEM对其组织和性能进行观察和分析。通过观察发现合金的组织为均匀的α+β相。运用XRD和TEM观察发现,晶界和晶内均有Nd2O3析出物,Nd2O3的出现细化了晶粒,提高了形核率,降低了晶粒尺寸。运用精密万能试验机进行了力学性能测试,当Nd元素含量为1%时,合金的综合力学性能最好,合金的抗拉强度提高了10.7%,伸长率提高了49.1%。
The Ti-6Al-4V-2Cr-xNd alloys were prepared by the cold isostatic pressing method and powder metallurgy with addition of Nd element, the effect of composition segregation on properties of the titanium alloy was eliminated, and microstructure and the properties of the alloy after heat treatment were studied by means of optical microscope, XRD and TEM. The results show that the microstructure of the Ti-6Al-4V-2Cr-xNd is composed of homogeneous ct ＋ [5 phase. Nd203 precipitates are observed in the grain boundaries and in the grains by XRD and TEM, and it can refine the grains, increase the nucleation rate and decrease the grain size. The optimal mechanical properties of the alloy are obtained when the Nd content is 1% , and the tensile strength and elongation of the alloy increase by 10. 7% and 49.1% , respectively.
作者
刘冀尧
王文焱
陈玉勇
张豪胤
黄亚博
谢敬佩
邵昌
LIU Ji-yao WANG ZHANG Hao-yin HUANG Ya-bol Wen-yan CHEN Yu-yong XIE Jinmg-pe SHAO Chang(School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China Collaborative Innovation Center of Nonferrous Metals Henan Province, Luoyang 471023, China School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China College of Material, Xiamen University, Xiamen 361005, China Xinjiang Minlong Wear-resisting Material Co Ltd, Kuitun 833200, China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2017年第7期44-49,共6页
Transactions of Materials and Heat Treatment
基金
军工"863"项目(2011412-1)
国防"973"支持项目
