CAJ | 학술논문

采用热模拟系统研究半固态变形参数对合金微观组织演变和元素分布的影响,并讨论变形过程中的Ti2Cu析出行为.结果表明:微观组织,特别是Ti2Cu析出过程受变形参数影响较大；温度的增加,应变速率和变形量的降低将促进Ti2Cu在晶界的偏析,最终形成了网状晶界结构.分析认为:半固态晶界的析出过程主要受控于包晶反应,升温或降低其他变形参数将有利于液相在晶界的析出,形成晶界Cu元素富集区.液相的偏析和Cu元素的富集增加了该区域的包晶反应,最终在冷却过程中形成了粗大的网状晶界结构.
채용열모의계통연구반고태변형삼수대합금미관조직연변화원소분포적영향,병토론변형과정중적Ti2Cu석출행위.결과표명:미관조직,특별시Ti2Cu석출과정수변형삼수영향교대；온도적증가,응변속솔화변형량적강저장촉진Ti2Cu재정계적편석,최종형성료망상정계결구.분석인위:반고태정계적석출과정주요수공우포정반응,승온혹강저기타변형삼수장유리우액상재정계적석출,형성정계Cu원소부집구.액상적편석화Cu원소적부집증가료해구역적포정반응,최종재냉각과정중형성료조대적망상정계결구.
The microstructural evolution and the element distribution of Til4 (a+Ti2Cu) alloy during semi-solid compression were investigated.Moreover,the Ti2Cu precipitate behaviors were discussed in detail.The results show that the microstructure,the number and distribution of Ti2Cu precipitates have significant dependence on the process parameters.More Ti2Cu will precipitate on grain boundaries at a higher deformation temperature,and/or a lower strain rate as well as deformation ratio,and finally a network structure is formed after deformation at 1100 ℃.The precipitation on grain boundaries is found to be mainly controlled by peritectic reactions.The elevated temperatures resulted in more liquid along the prior grain boundaries,and a Cu-rich region is formed,finally.the "coarse" grain boundaries appear during re-solidification.