【摘要】：定量研究了7055鋁合金進行多道次熱變形及固溶處理中的微觀組織演變,采用Gleeble-1500D熱模擬試驗機對7055鋁合金進行多道次熱壓縮,并對熱壓縮試樣進行固溶處理。以EBSD為主要分析手段,對平均晶粒尺寸、再結晶體積分數(shù)、大角度晶界比例等微觀組織特征進行定量表征。結果表明:升高變形溫度和減少變形道次均有利于增大亞結構比例并且抑制再結晶。當變形溫度由375℃升高到425℃時,7055鋁合金固溶態(tài)顯微組織的晶粒平均尺寸由65μm增大到420μm,再結晶體積分數(shù)由51%減小到10%;當變形道次由單道次增加到3道次時,固溶態(tài)顯微組織的晶粒平均尺寸由56μm增大到84μm,再結晶體積分數(shù)由14%增大到23%。
[Abstract]:The microstructure evolution of 7055 aluminum alloy during multi-pass thermal deformation and solid solution treatment was studied quantitatively. 7055 aluminum alloy was subjected to multi-pass thermal compression by Gleeble-1500D thermal simulation tester, and the hot compression sample was treated with solid solution. The microstructure characteristics of average grain size, recrystallized volume fraction and large angle grain boundary ratio were quantitatively characterized by EBSD. The results show that the increase of deformation temperature and the decrease of deformation pass are beneficial to increase the proportion of substructure and inhibit the crystallization. When the deformation temperature increases from 375 鈩，

本文編號：2481249