锻压技术

建筑用6061+Er铝合金的热变形行为与热加工图

英文标题：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

单位：信阳农林学院规划与设计学院中南大学材料科学与工程学院北京科技大学材料科学与工程学院

分类号：TG146.2

出版年,卷(期):页码：2022,47(11):254-260

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Al3Er相和起弥散强化效果的纳米级次生Al3Er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 s-1 were analyzed by scanning electron microscope, transmission electron microscope and thermal simulation test machine Gleeble-3800. The results show that there are micron primary Al3Er phase and nano secondary Al3Er 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 s-1 and 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.

基金项目：

国家自然科学基金资助项目（51708448）

作者简介：耿城（1979-），男，硕士，副教授，E-mail：419142058@qq.com

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