论文标题
Ti合金中时间依赖性可塑性的宏观分析
Macroscopic analysis of time dependent plasticity in Ti alloys
论文作者
论文摘要
由于钛及其合金的寒冷疲劳而导致的组成部分失败是一个长期存在的问题，对航空业具有重大的安全性和经济影响。这可以通过了解低温下Ti的时间依赖性可塑性行为的管理机理来解决。在这里，在三个主要合金系统上的四个不同温度下进行了压力放松测试：商业上纯钛（两种具有不同氧含量的合金），TI-6AL-4V（两个具有不同β相位分数的微结构）和TI-6AL-2SN-2SN-2SN-4ZR-4ZR-4ZR-XMO（两个具有不同MO含量的MO含量X = 2或6 = 2或6 = 2或6和6，earta）和earta incapion of BETA和阶段。控制时间依赖性可塑性的关键参数是根据温度的函数确定的。在所有六种合金中，激活量和能量均随温度升高。已经发现，氧气合金的住宅疲劳效应更为重要，但由于添加MO而被抑制。β期的存在并未强烈影响停留疲劳，但是由于低应变率和应变速率敏感性，在高温下被抑制。
Component failure due to cold dwell fatigue of titanium and its alloys is a long-standing problem which has significant safety and economic implications to the aviation industry. This can be addressed by understanding the governing mechanisms of time dependent plasticity behaviour of Ti at low temperatures. Here, stress relaxation tests were performed at four different temperatures on three major alloy systems: commercially pure titanium (two alloys with different oxygen content), Ti-6Al-4V (two microstructures with differing beta phase fractions) and Ti-6Al-2Sn-4Zr-xMo (two alloys with different Mo content x= 2 or 6, and portion of beta phase). Key parameters controlling the time dependent plasticity were determined as a function of temperature. Both activation volume and energy were found to increase with temperature in all six alloys. It was found that the dwell fatigue effect is more significant by oxygen alloying but is suppressed by the addition of Mo. The presence of the beta phase did not strongly affect the dwell fatigue, however, it was suppressed at high temperature due to the low strain rate and strain rate sensitivity.
