锻压技术

挤压态6082铝合金热变形行为及组织

英文标题：Thermal deformation behavior and microstructure on extruded 6082 aluminum alloy

单位：1.山东南山铝业有限公司 2. 山东南山科学技术研究院有限公司 3.烟台南山学院

分类号：TG146.21

出版年,卷(期):页码：2023,48(11):238-248

摘要：

使用Gleeble-3500热模拟试验机研究了6082铝合金在变形温度为350~500 ℃、应变速率为0.01~10 s-1条件下沿挤压变形方向的热变形行为，得到了真应力-真应变曲线，并建立了本构方程。为了研究挤压态6082铝合金型材的热加工性能，绘制了应变ε=0.3、0.9和峰值应力下的热加工图，并利用光学显微镜（OM）、扫描电子显微镜（SEM）、显微硬度计等设备分析了热压缩后的显微组织、第二相尺寸和材料硬度变化。结果表明：热压缩过程中，挤压态6082铝合金的强度无明显降低，主要软化机制为动态回复；第二相含量随着变形温度的升高逐渐降低，而第二相破碎程度随之升高，且维氏硬度也随之增大。经计算，挤压态6082铝合金的热变形激活能为205.74 kJ·mol-1，该合金较好的热加工工艺范围为465~500 ℃/0.01~0.7 s-1。

The thermal deformation behavior of 6082 aluminum alloy along the extrusion deformation direction under the deformation temperature of 350-500 ℃ and strain rate of 0.01-10 s-1 was studied by using thermal simulation testing machine Gleeble-3500, the true stress-true strain curves were obtained, and the constitutive equation was established. Then, in order to study the thermal processing performance of extruded 6082 aluminum alloy profiles, the thermal processing diagrams under the strains of 0.3 and 0.9 and the peak stress were drawn, and the changes of microstructure, the second phase size and material hardness after thermal compression were analyzed by optical microscope (OM), scanning electron microscope (SEM), microhardness tester and other devices. The results show that the strength of the extruded 6082 aluminum alloy does not decrease significantly during the thermal compression process, and the main softening mechanism is dynamic recovery. The content of the second phase gradually decreases with the increasing of deformation temperature, but the fragmentation degree of the second phase increases, and the Vickers hardness after thermal compression also increases. After calculation, the thermal deformation activation energy of extruded 6082 aluminum alloy is 205.74 kJ·mol-1, and it is recommended that the better thermal processing process range of this alloy is 465-500 ℃/0.01-0.7 s-1.

基金项目：

作者简介：杨鑫（1997-），男，硕士，E-mail：yangxin1@nanshan.com.cn；通信作者：孙有政（1987-），男，博士，高级工程师，E-mail：sunyouzheng@nanshan.com.cn

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