建筑用6061+Er铝合金的热变形行为与热加工图  

Thermal deformation behavior and thermal processing map on 6061+Er aluminum alloy for building

作　　者：耿城 罗志勇 王兰浩 董瑞华[3] Geng Cheng;Luo Zhiyong;Wang Lanhao;Dong Ruihua(School of Planning and Design,Xinyang Agriculture and Forestry University,Xinyang 446000,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]信阳农林学院规划与设计学院,河南信阳446000 [2]中南大学材料科学与工程学院,湖南长沙410083 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《锻压技术》2022年第11期254-260,共7页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(51708448)。

摘　　要：为了改善6061+Er铝合金的热加工性,通过扫描电镜、透射电镜和Gleeble-3800热模拟试验机,研究了6061+Er铝合金的微观组织,以及当变形温度为375~500℃、应变速率为0.001~10 s^(-1)时的热变形行为。结果表明,锻态6061+Er铝合金中存在微米级初生Al_(3)Er相和起弥散强化效果的纳米级次生AlEr相。建立了6061+Er铝合金热压缩变形过程中的流变应力本构方程,当应变速率为0.001~10 s^(-1)、变形温度为375~500℃时,流变应力计算值与峰值真应力实测值的误差<10%,验证了流变应力本构方程的准确性和可靠性。6061+Er铝合金适宜的热加工范围为:变形温度为375~400℃、应变速率为0.001~0.01 s^(-1)。In order to improve the thermal workability of 6061+ Er aluminum alloy, the microstructure of 6061+ Er aluminum alloy and its thermal deformation behavior under the deformation temperature of 375-500 ℃ and the strain rate of 0.001-10^(-1) swere analyzed by scanning electron microscope, transmission electron microscope and thermal simulation test machine Gleeble-3800. The results show that there are micron primary Al_(3)Er phase and nano secondary Al_(3)Er phase with dispersion strengthening effect in forged 6061+Er aluminum alloy. The constitutive equation of rheology stress during the thermal compression deformation process for 6061+Er aluminum alloy is established, and the error between the calculated value of rheology stress and the measured value of peak true stress under the strain rate of 0.001-10^(-1) sand the deformation temperature of 375-500 ℃ is less than 10%, the accuracy and reliability of the rheology stress constitutive equation are verified. Thus, the suitable thermal processing range of 6061+Er aluminum alloy is that the deformation temperature is 375-400 ℃ and the strain rate is 0.001-0.01 s^(-1).

关 键 词：6061+Er铝合金 热变形行为 变形温度 应变速率 热加工图 流变应力 

分 类 号：TG146.2[一般工业技术—材料科学与工程]