(1. 重慶大學(xué) 國家鎂合金材料工程技術(shù)研究中心，重慶400044；
2. 西南鋁業(yè)(集團)有限責(zé)任公司，重慶401326)
摘 要: 對高硅鋁合金光譜標(biāo)準(zhǔn)樣品在應(yīng)變速率為0.01~1 s−1、變形溫度為350~500 ℃條件下的熱壓縮變形行為進行實驗研究。結(jié)果表明：高硅鋁合金熱壓縮變形中發(fā)生了明顯的動態(tài)回復(fù)與動態(tài)再結(jié)晶，流變應(yīng)力隨應(yīng)變速率的增加而增加，隨溫度的增加而降低；通過線性回歸分析計算出高硅鋁合金材料的應(yīng)變硬化指數(shù)n以及變形激活能Q，獲得了高硅鋁合金高溫條件下的流變應(yīng)力本構(gòu)方程；研究工藝參數(shù)(變形溫度t、應(yīng)變速率 )對晶粒尺寸的影響，確定最佳工藝參數(shù)：t=400 ℃， =0.1 s−1。
關(guān)鍵字: 高硅鋁合金；熱變形；流變應(yīng)力；激活能
（1. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;
2. Southwest Aluminum(Group)Co., Ltd., Chongqing 401326, China）
Abstract:The flow stress behavior of high silicon aluminum alloy standard sample was investigated in the temperature range of 350−500 ℃and strain rate of 0.01−1 s−1. The results show that the dynamic recovery and dynamic recrystallization occur obviously during hot compression of high silicon aluminum alloy. The flow stress increases with increasing strain rates and decreases with increasing temperature. The strain hardening coefficient n and deformation activation energy Q are evaluated by linear regression analysis. And the flow stress constitutive equation of high silicon aluminum alloy during hot compression is obtained. The influence of the processing parameters (deformation temperature t, strain rate ) on grain sizes was studied. The optimal processing parameters, t=400 ℃, =0.1 s−1 were determined.
Key words: high-silicon aluminum alloy; hot deformation; flow stress; activation energy
