摘要
采用MTS万能材料试验机和分离式Hopkinson Bar技术,分别对激光快速成形与传统锻造TC4钛合金进行了准静态及动态压缩试验,研究了2种制备方法生产TC4钛合金的力学行为.结果显示,在准静态和动态压缩变形下,锻造TC4−1#(forging TC4−1#)等轴组织均表现出最好的塑性及强度,且呈现出较强的应变强化效应;锻造TC4−2#(forging TC4−2#)网篮组织及激光快速成形TC4(LRF TC4)网篮组织在准静态条件下压缩时,表现出了相同的力学响应规律,即强度、塑性相当,应变强化效应较弱.在动态压缩变形下,锻造TC4−2#网篮组织和激光快速成形TC4沉积态网篮组织塑性相当,但前者的动态流变应力高于后者.3种材料均为应变率敏感材料,但应变率效应不同;锻造TC4−2#材料显示了最高的应变率敏感性,激光快速成形TC4材料应变率敏感性最弱,锻造TC4−1#材料敏感性居于二者之间.
Using MTS universal material testing machine and split Hopkinson bar,quasi static and dynamic compression tests were carried out on laser rapid forming and conventional forging TC4 titanium alloy and the mechanical behavior of TC4 titanium alloy produced by two methods has been studied.The results show that the forging TC4−1#with the equiaxed microstructure exhibits the best plasticity,strength and relative strong strain hardening effectinthe quasi-static and dynamic compression.In the quasi-static compression,the forging TC4−2#with the basket structure and laser rapid forming TC4 with the basket structure show the same mechanical response law:the strength and plasticity are equivalent,and the strain hardening effect is weak.In the dynamic compression,the plasticity of the forging TC4−2#and LRF TC4 is similar,but the dynamic rheological stress of the former is higher than that of the latter.All of the three materials are sensitive materials to the strain-rate,but their strain-rate effects are different.Forging TC4−2#material shows the highest strain rate sensitivity,whereas the LRF TC4 material displays lower sensibility to the strain-rate,and the sensibility of the forging TC4−1#is between the former and the latter.
作者
向文丽
徐媛
孙坤
XIANG Wen-li;XU Yuan;SUN Kun(Research Institute on Preparation and Mechanical Behavior of Materials,Chuxiong Normal University,Chuxiong 675000,Yunnan,China)
出处
《云南大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第1期108-114,共7页
Journal of Yunnan University(Natural Sciences Edition)
基金
国家自然科学基金(51561002).
作者简介
向文丽(1982−),女,云南人,硕士,实验师,主要研究材料制备及力学行为.E-mail:wenlixiang@cxtc.edu.cn;通信作者:孙坤(1971−),男,云南人,博士,教授,硕士生导师,主要研究材料制备及力学行为.E-mail:sunkun@cxtc.edu.cn.
