Microstructural evolution of near-β Ti-6Zr-5Fe alloy fabricated by selective laser melting before and after solution treatment

被引：6
作者：
Qi, Peng [1 ]
Li, Bolong [1 ]
Wang, Tongbo [2 ]
Zhou, Lian [1 ,3 ]
Nie, Zuoren [1 ]
机构：
[1] Beijing Univ Technol, Fac Mat & Mfg, Key Lab Adv Funct Mat, Minist Educ, Beijing 100124, Peoples R China
[2] Aluminum Corp China Ltd, Chinalco Mat Applicat Res Inst, Beijing 102209, Peoples R China
[3] Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 862卷
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
Ti-6Zr-5Fe alloy; Selective laser melting; Solution treatment; Microstructural homogeneity;
D O I：
10.1016/j.jallcom.2020.158496
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The homogeneity of microstructure and microhardness in different parts of as-fabricated selective laser melting (SLM) and as-solutionized Ti-6Zr-5Fe alloy is presented in this paper. The results show that the as-fabricated SLM alloy has a bigger beta phase and finer alpha phase size in the top part than that in the bottom part due to the reheating treatment during SLM process. However, as-solutionized Ti-6Zr-5Fe alloy mainly consists of beta phase in the top part, and the bottom part is mainly comprised of beta and alpha phase in the grain boundary. Apart from the change of phase composition, the beta phase size in bottom part is smaller than that in the top part, due to the precipitation of alpha phase at the grain boundary in the bottom part. The fine alpha phase in the top part of as-fabricated SLM Ti-6Zr-5Fe alloy results in that the top part has a higher microhardness (518 HV) than the bottom part (394 HV). While, the microhardness becomes almost the same in the top part (482 HV) and bottom part (475 HV) after solid solution treatment. The dissolution of fine alpha phase in the top part and solution strengthening of Fe and Zr element in the bottom part after solution treatment improve the uniformity of microhardness. This research provides an approach for obtaining the gradient microstructure or gradient property for near-beta Ti alloy samples by governing the parameters of SLM technology and solution treatment. (C) 2021 Elsevier B.V. All rights reserved.
引用
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页数：6
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