次生片层α相宽度对双态组织TC4钛合金动态压缩性能及其绝热剪切敏感性的影响  

Effects of Secondary α Phase Width on Dynamic Mechanical Properties and Sensitivity of Adiabatic Shear Banding in Bimodal Microstructures of TC4 Alloy

作　　者：彭美旗 程兴旺[1] 郑超[1] 杨凯文[1] 靳丹[1] 

机构地区：[1]北京理工大学冲击环境材料技术重点实验室,北京100081

出　　处：《稀有金属材料与工程》2017年第7期1843-1849,共7页Rare Metal Materials and Engineering

摘　　要：研究了冷却速率对双态组织TC4钛合金中次生片层α相宽度的影响,并利用分离式霍普金森压杆,进一步研究了次生片层α相宽度对双态组织TC4钛合金动态压缩性能及其绝热剪切敏感性的影响。结果表明:随着冷却速率的降低,次生片层α相宽度随之增加;在动态压缩实验条件下,合金的动态抗压强度随着次生片层α相宽度的增加,呈现逐渐降低的规律,而塑性应变则随着次生片层α相宽度的增加,呈现出逐渐增加的规律;在强迫剪切实验条件下,合金的绝热剪切敏感性随着次生片层α相宽度的增加,呈现出逐渐降低的规律,且各双态组织TC4钛合金均随着撞击杆初速的提高,其绝热剪切敏感性增加。Dynamic mechanical properties and sensitivity of adiabatic shear banding of TC4 alloy with bimodal microstructures were investigated using Split Hopkinson Bar. The bimodal microstructures with different-width secondary α phase（αs） were obtained via different heat treatment. The results show that the width of αs increases with the decreasing of cooling rate. In dynamic compression experiments, the dynamic strength decreases as the width of αs increases; while the dynamic strain exhibits an opposite trend. In forced shearing experiments, the sensitivity of adiabatic shear banding decreases as the width of αs increases. Besides, the sensitivity of adiabatic shear banding increases for the same microstructure with the increasing of impact velocity.

关 键 词：TC4钛合金 次生片层α相 动态压缩性能 绝热剪切敏感性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]