压应力下Ti-1300合金ω相变研究  

ω Phase Transformation of Ti-1300 Alloy under Compressive Stress

作　　者：张珍宣 雷旻[1] 万明攀[1] 马瑞[1] 

机构地区：[1]贵州大学贵州省材料结构与强度重点实验室,贵州贵阳550025

出　　处：《稀有金属材料与工程》2017年第11期3277-3281,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(51401058);贵州省科技联合资金项目(黔科合LH字[2015]7655号);贵州省优秀青年科技人才培养对象项目(201315);贵州省重大专项(黔科合重大专项字[2014]6013)

摘　　要：采用高分辨膨胀仪DIL 805 A/D研究了20 MPa压应力作用下Ti-1300合金在连续加热过程中ω相变。结果表明:20 MPa压应力抑制Ti-1300合金在连续加热时ω相变,相变开始点较无应力时有一定滞后。根据Kissinger-Akahira-Sunose模型计算得出20 MPa压应力作用下Ti-1300合金的ω相变的平均激活能为73 kJ/mol,高于无应力条件下的平均相变激活能(55 kJ/mol),亦说明压应力对合金的ω相变有一定的抑制作用,使β→ω相变更加困难。然而连续加热转变中,随ω相转变量的增加而相变激活能逐渐减小,说明压应力对ω相变的抑制作用逐渐减弱。The ω phase transformation of Ti-1300 alloy under 20 MPa compressive stress during continuous heating was investigated using high resolution dilatometer DIL 805 A/D. Results show that the ω phase transformation of Ti-1300 alloy can be inhibited by 20 MPa compressive stress during continuous heating. The local activation energy of ω phase transformation for Ti-1300 alloy was determined on the basis of Kissinger-Akahira-Sunose（KAS） method. The average activation energy of ω phase transformation is about 73 kJ/mol under 20 MPa compressive stress, which is higher than that with no stress condition（55 kJ/mol）. However, the compress stress is able to inhibit the ω phase transformation of Ti-1300 alloy during continuous heating. Therefore, since the activation energy decreses with increase of transformed volume fraction fω, the inhibiting effect of compressive stress on ω phase transformation of Ti-1300 alloy is gradually weakened.

关 键 词：应力 Ω相 激活能 Ti-1300合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程]