热压缩工艺对7150 铝合金显微组织的影响
Hot Working Technology（2017）
Abstract
采用Gleeble-1500 热模拟机对7150 铝合金在热压缩温度为300～450 ℃,变形量33％～87％下进行热压试验.采用光学显微镜、扫描电镜和透射电镜观察合金热压缩试验后的显微组织.结果表明,在热压缩变形过程中,7150铝合金流变应力经历了过渡变形与稳态变形两个阶段.在低于350℃下变形,变形抗力较大;400℃下变形,33％～87％变形量下,变形量越小,达到稳态变形应力越低,变形量达到60％以上时,稳态流变应力趋于稳定;变形温度达到420℃时发生动态再结晶,变形速率对组织均匀性影响巨大,变形速率越快,得到的再结晶后的组织越均匀;在400℃以下压缩变形,残留的第二相回溶速率慢,随变形温度的升高,第二相逐渐消失.
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