β转变组织TA15钛合金塑性流动失稳行为  

Plastic Flow Instability Behavior of TA15 Titanium Alloy with β Transformed Microstructure

作　　者：董显娟[1] 鲁世强[1] 王克鲁[1] 欧阳德来[1] Dong Xianjuan;Lu Shiqiang;Wang Kelu;Ouyang Delai(Nanchang Hangkong University, Nanchang 330063, Chin)

机构地区：[1]南昌航空大学,江西南昌330063

出　　处：《稀有金属材料与工程》2018年第5期1485-1491,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51261020);航空科学基金(2014ZE56015);江西省教育厅科学技术项目(GJJ150734)

摘　　要：采用THERMECMASTOR-Z型热模拟实验机对魏氏和网篮2种β转变组织TA15钛合金在温度750~950℃、应变速率0.001~10s^(-1)范围进行等温恒应变速率压缩实验。结果表明,2种β转变组织钛合金在低温(750~880℃)和高应变速率(0.0032~10s^(-1))范围存在较大区域的塑性流动失稳,且魏氏组织发生塑性流动失稳的范围更大。魏氏组织的塑性流动失稳缺陷主要有45°宏观剪切裂纹、微裂纹和局部流动带,网篮组织的塑性流动失稳缺陷主要有45°宏观剪切裂纹和局部流动带。魏氏组织比网篮组织更容易发生塑性流动失稳与其α层片粗大导致变形协调性差有关。An isothermal constant strain rate compression test was performed on TA15 titanium alloy with two types of fl transformed microstructures of basket-weave and Widmannstatten in the temperature range of 750-950 ℃ and the strain rate range of 0.001-10 s1. The results show that there is a wide range of p strain rate regions （750-880 ℃, 0.0032-10 lasti s-1）. c flow instability in the two fl transformed microstructures in low temperature and high The instability range of Widmannstatten microstructure is larger than that of the basket-weave microstructure. The instability defects of Widmannstatten microstructure mainly include 45° macro shear crack, microcrack and flow localization band, while the defects of basket-weave microstructure are chiefly 45° macro shear crack and flow localization band The plastic flow instability is more likely to occur in Widmannstatten microstructure than in the basket-weave one, which is primarily due to the poor deformation coordination caused by the coarse lamellar a in Widmannstatten microstructure

关 键 词：β转变组织 流动失稳 局部流动带 原始β晶粒边界 等轴化 

分 类 号：TG146.23[一般工业技术—材料科学与工程]