Microstructure and mechanical properties of AZ31 magnesium alloy reinforced with novel sub-micron vanadium particles by powder metallurgy
Microstructure and mechanical properties of AZ31 magnesium alloy reinforced with novel sub-micron vanadium particles by powder metallurgy
复制标题
粉末冶金新型亚微米钒颗粒增强AZ31镁合金的显微组织与力学性能
DOI：
10.1016/j.jmrt.2021.09.015
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发表时间：
2021-09-17
影响因子：
6.4
通讯作者：
Wang, Xin
中科院分区：
文献类型：
--
作者：
Sun, Shuai;Deng, Nana;Wang, Xin
采用粉末冶金法制备了亚微米级钒颗粒增强AZ 31镁合金。结果表明，V-P能加速位错的堆积和细化晶粒。球磨90 h后，镁基体细化至纳米晶尺度，最终晶粒尺寸仅为25 nm。同时，亚微米级V-P在镁基体中分布均匀。热挤压后镁基体的平均晶粒尺寸为3.08 mm，达到了细晶化程度。此外，AZ 31 - 2.5wt% V-P复合材料表现出竞争性的机械性能。与铸态AZ 31镁合金相比，V-P含量为2.5wt %的AZ 31镁合金的显微硬度、屈服强度、抗拉强度和伸长率分别提高了102%、128%、59%和10%。晶界强化对强度的提高起主导作用。同时，热失配、Orowan强化和载荷传递等强化机制也对材料的力学性能有一定的贡献。AZ 31 - 2.5wt % V-P复合材料的断裂机制包括韧性断裂和脆性断裂。(c)2021年，任作者。由Elsevier B. V.发布。这是CC BY-NC-ND许可证下的开放获取文章（http：//creativecommons.org/licenses/by-nc-nd/4.0/）。
In this study, a novel fine-grained AZ31 magnesium (Mg) alloy reinforced with sub-micron vanadium particles (V-P) was prepared by powder metallurgy (P/M). It was found that V-P could accelerate the pile-up of dislocations and the refinement of Mg crystallite sizes during the milling process. The Mg matrix was refined to nanocrystalline scale after milling for 90 h, and the ultimate average crystallite size was only 25 nm. Meanwhile, a homo-geneous distribution of the sub-micron V-P in Mg matrix was achieved. After hot-extrusion process, the average grain size of Mg matrix was 3.08 mm, which reached fine-grained scale. Additionally, the AZ31-2.5 wt % V-P composite exhibited competitive mechanical properties. Compared to the as-cast AZ31 Mg alloy, the microhardness, yield strength, ultimate tensile strength and elongation of AZ31-2.5 wt % V-P composite increased by 102%, 128%, 59% and 10%, respectively. The grain boundary strengthening played a dominant role in improve-ment of strength. Simultaneously, the strengthening mechanisms of thermal mismatch, Orowan strengthening and load transfer also made a contribution. Besides that, the fracture mechanism of the AZ31-2.5 wt % V-P composite included ductile and brittle fracture mode. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).