| 时效时间对AZ80A镁合金中不连续析出相、连续析出相和力学性能的影响（英文） |
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| 引用本文： | 张克龙,李慧中,梁霄鹏,陈智,赵梓轩,陶慧,周雄文.时效时间对AZ80A镁合金中不连续析出相、连续析出相和力学性能的影响（英文）[J].中国有色金属学会会刊,2022,32(9):2838-2851. |
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| 作者姓名： | 张克龙 李慧中 梁霄鹏 陈智 赵梓轩 陶慧 周雄文 |
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| 作者单位： | 1. 中南大学材料科学与工程学院;2. 中南大学粉末冶金国家重点实验室;3. 中南大学有色金属材料科学与工程教育部重点实验室;4. 中南大学湘雅医院口腔医学中心口腔修复科 |
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| 基金项目： | financially supported by the Natural Science Foundation of Hunan Province, China (No. 2018JJ2503)； |
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| 摘 要： | 通过SEM原位观察、TEM观察和拉伸试验，研究AZ80A镁合金中析出相和力学性能随时效时间的演变规律。结果表明，在时效初期，反应前沿附近由连续析出(CP)产生的析出相逐渐被由不连续析出(DP)产生的析出相所取代。随着时效时间的延长，DP区中的椭圆相明显粗化，导致DP区的晶内硬度缓慢降低；而在CP区，初始析出片状相长大的同时，还析出一些细小的片状相，这使得CP区的晶内硬度在时效后期继续缓慢增加。与CP区相比，DP区具有更快、更强的时效硬化行为。然而，CP区的时效强化不仅可以弥补DP区的过时效软化，而且还能提高合金的强度。
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| 关 键 词： | 时效强化 不连续析出 粗化 原位观察 力学性能 镁合金 |
| 收稿时间： | 17 August 2021 |
Effect of aging time on discontinuous precipitates,continuous precipitates and mechanical properties of AZ80A magnesium alloy |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;3. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China;4. Department of Prosthodontics, Center of Stomatology, Xiangya Hospital, Central South University, Changsha 410008, China |
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| Abstract: | The evolution of precipitates and mechanical properties of AZ80A magnesium alloy with aging time was studied by in situ observation with SEM, TEM and tensile testing. The results show that the continuous precipitation (CP) phases near the reaction front (RF) are replaced by the discontinuous precipitation (DP) phases at the early aging stage. In DP regions, the elliptical phases coarsen obviously with the increase of aging time, which results in a slightly slow reduction of the intracrystalline hardness of DP regions. In CP regions, some small plate phases reprecipitate simultaneously with the growth of the initial precipitates, which contributes to a slight increase in the intracrystalline hardness in CP regions at the later aging stage. The aging hardening of DP regions is faster and stronger than that of CP regions. However, the age strengthening of CP regions not only compensates for the overaging softening of DP regions but also improves the strength of the alloy. |
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| Keywords: | age hardening discontinuous precipitation coarsening in situ observation mechanical properties magnesium alloy |
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