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挤压前的时效处理对AZ80镁合金组织和力学性能的影响
作者:
作者单位:

重庆大学,重庆大学,重庆大学,重庆大学,重庆大学,重庆大学

基金项目:

国家自然科学基金项目（面上项目，重点项目，重大项目）;国家重点基础研究发展计划（973计划）


Effect of aging treatment before extrusion on microstructure and mechanical properties of AZ80 magnesium alloy
Author:
Affiliation:

College of Materials Science and Engineering,Chongqing University,Chongqing,College of Materials Science and Engineering,Chongqing University,Chongqing,College of Materials Science and Engineering,Chongqing University,Chongqing,College of Materials Science and Engineering,Chongqing University,Chongqing,College of Materials Science and Engineering,Chongqing University,Chongqing,National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing

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    摘要:

    本文主要研究了挤压前的时效处理工艺对AZ80镁合金显微组织的力学性能的影响,同时结合扫描电子显微镜对断口进行分析。结果表明：挤压前时效处理可以明显细化晶粒；时效过程中析出的Mg17Al12粒子弥散分布在晶界处,在动态再结晶过程中起到阻碍晶界移动、阻止晶粒长大、细化组织的作用；随着时效时间的延长或者时效温度的提高,晶粒细化效果减弱；时效后进行挤压,材料的屈服强度、抗拉强度和延伸率均提高。通过对断口形貌的分析发现,早期裂纹产生于晶界处粗大的第二相周围,导致了拉伸过程中延伸率的下降。本文中挤压前时效处理对AZ80的强化效果为高性能镁合金的设计和开发提供了一种全新的思路。

    Abstract:

    This paper investigated the effect of aging treatment before extrusion on microstructure and mechanical properties of AZ80 magnesium alloy. Fractural microstructures of the test specimens were also analyzed by scanning electron microscopy. Results show that aging treatment before extrusion can remarkably promote grain refinement; the dispersed Mg17Al12 particles that precipitated from the matrix during aging treatment before extrusion distribute in the grain boundaries, during the subsequent extrusion process these particles can pin grain boundaries migration and lead to fine microstructure; however, with prolonging the aging time, the grain refinement effect was weakened. After aging treatment and subsequent extrusion, the yield strength, tensile strength and elongation are increased. Based on fracture surface analyzed, the premature cracks generate around big particles that present in grain boundaries lead to loss of elongation. The strengthening effect of aging before extrusion in AZ80 magnesium alloy proven in this paper provides a new method for the design of the relatively high-performance magnesium alloys.

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孙静,张丁非,唐甜,余大亮,胥钧耀,潘复生.挤压前的时效处理对AZ80镁合金组织和力学性能的影响[J].稀有金属材料与工程,2017,46(7):1768~1774.[Jing Sun, Dingfei Zhang, Tian Tang, Daliang Yu, Junyao Xu, Fusheng Pan. Effect of aging treatment before extrusion on microstructure and mechanical properties of AZ80 magnesium alloy[J]. Rare Metal Materials and Engineering,2017,46(7):1768~1774.]
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  • 收稿日期:2015-04-19
  • 最后修改日期:2015-09-07
  • 录用日期:2015-10-13
  • 在线发布日期: 2017-11-14

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