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等温锻造工艺下铸态抗菌Ti6Al4V-5Cu合金的微观组织演变及变形机制

Microstructure Evolution and Deformation Mechanisms of As-Cast Antibacterial Ti6Al4V-5Cu Alloy for Isothermal Forging Process.

作者信息

Yeshanew Solomon Kerealme, Bai Chunguang, Jia Qing, Xi Tong, Zhang Zhiqiang, Li Diaofeng, Xia Zhizhou, Yang Rui, Yang Ke

机构信息

Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS), Shenyang 110016, China.

School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China.

出版信息

Materials (Basel). 2022 May 6;15(9):3349. doi: 10.3390/ma15093349.

DOI:10.3390/ma15093349
PMID:35591683
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9105015/
Abstract

The hot workability behavior of antibacterial Ti6Al4V-5Cu alloy was investigated using a hot compression experiment in the temperature range of 790-1040 °C and strain rate of 10-10 s with a strain of 0.4. The deformation behavior of the alloy was characterized by Gleeble 3800 compression experiment, and the relationship among deformed microstructures and deformation parameters was established. The deformations of Ti6Al4V-5Cu alloy were temperature and strain rate-dependent. Higher temperature and lower strain rate made power dissipation efficiency (η) increase and reach 89%. The activation energies (Q) in the dual-phase (α + β) and single β phase regions were calculated as 175.43 and 159.03 kJ mol, respectively. In the dual (α + β) phase region, with an increase in strain rate, flow-softening behavior was dominated, however in the single β phase region such as processing at 940 °C. Flow stress increased slightly in which work-hardening behavior was dominated (especially between strain rates of 10-1 s). The deformation at various conditions exhibited different stress-strain profiles, providing an insight that work hardening and flow softening coexisted in Ti6Al4V-5Cu alloy. The relative intensity of oscillatory change in flow stress profile decreased as the strain rate decreased. The hot workability of Ti6Al4V-5Cu alloy was also accessed from the viewpoint of the sub-grain structure.

摘要

采用热压缩试验研究了抗菌Ti6Al4V-5Cu合金在790-1040°C温度范围、10-10 s应变速率和0.4应变条件下的热加工性能。通过Gleeble 3800压缩试验表征了合金的变形行为，并建立了变形微观组织与变形参数之间的关系。Ti6Al4V-5Cu合金的变形与温度和应变速率有关。较高的温度和较低的应变速率使功率耗散效率（η）增加并达到89%。计算出双相（α+β）区和单相β区的激活能（Q）分别为175.43和159.03 kJ/mol。在双相（α+β）区，随着应变速率的增加，流动软化行为占主导，然而在单相β区，如在940°C加工时，流动应力略有增加，其中加工硬化行为占主导（特别是在10-1 s的应变速率之间）。不同条件下的变形表现出不同的应力-应变曲线，这表明Ti6Al4V-5Cu合金中加工硬化和流动软化共存。随着应变速率的降低，流动应力曲线振荡变化的相对强度降低。还从亚晶粒结构的角度评估了Ti6Al4V-5Cu合金的热加工性能。

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