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强力旋压镁合金筒形件的显微组织及微纳力学性能
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太原理工大学 材料科学与工程学院,太原理工大学 材料科学与工程学院,太原理工大学 材料科学与工程学院,太原理工大学 材料科学与工程学院,太原理工大学 材料科学与工程学院

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国家自然科学基金资助(项目号51375328)


Microstructure and Micro/nano Mechanical properties of Maganesuim alloy Tube
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College of Materials Science and Engineering,Taiyuan University of Technology,College of Materials Science and Engineering,Taiyuan University of Technology,College of Materials Science and Engineering,Taiyuan University of Technology,College of Materials Science and Engineering,Taiyuan University of Technology,College of Materials Science and Engineering,Taiyuan University of Technology

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    摘要:

    本文以AZ31镁合金的强力旋压成型工艺为例,通过六道次旋压成型获得镁合金筒形件,对其各道次组织演变规律及筒坯的微纳力学性能进行了分析。原始筒坯壁厚为10 mm经六道次强力旋压成型,获得了壁厚为1 mm的成型良好、无鼓包等缺陷的镁合金筒形件;采用金相显微镜对各道次的筒坯试样的显微组织进行分析,结果表明:组织由原始粗大的、不均匀组织逐步转变为以孪晶为主、细小的均匀的组织;采用G200微纳力学测试系统对各道次的镁筒坯试样进行纳米压痕测试分析,结果表明:镁合金筒坯硬度随着旋压道次的增加而提高,原始镁合金筒坯硬度为0.377 GPa,六道次旋压后镁合金筒坯的硬度为1.053 GPa,提高约2.8倍,而旋压前后模量值保持基本不变;采用万能试验机对旋压成型的筒形件的拉伸试验及断口SEM分析,结果表明:旋压前后的镁合金筒坯断口均呈现塑性断裂,但是原始镁合金断口中韧窝大而深,经多道次旋压后的断口中韧窝小而浅。

    Abstract:

    In this paper, as the example of AZ31 magnesium alloy, the process of magnesium alloy spun tube with the sixth spinning passes has been studied, and the microstructue evolution and the micro/nan mechanical properties of the tube billet has been analyzed. The magnesium alloy tube with the wall thickness of 1 mm from the wall thickness of 10 mm has a good forming and no bulge defects, such as bump by power spinning testing. The microstructure of the tube samples with several spinning passes was analysed by optical microsco. The results show that the grain distribution from original coarse and uneven grain transform to main twin, even and fine grain characteristic. The nanoindentor properties were tested by G200 Micro-nano mechanics test system. The results present that the hardness increased with the spinning passes, and the hardness were 0.377 GPaand 1.053 GPa, respectively. The modulus of original and after power spinning magnesium alloy tube samples were with features of plastic fracture. However, The fracture original magnesium alloy tube was dimple fracture with larger and deeper. On the contrary, the fracture after power spinning was dimple fracture with small and shallow.

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张婷婷,王文先,曹晓卿,林鹏,魏屹.强力旋压镁合金筒形件的显微组织及微纳力学性能[J].稀有金属材料与工程,2018,47(5):1573~1577.[Zhang Tingting, Wang Wenxian, Cao Xiaoqing, Lin Peng, Wei Yi. Microstructure and Micro/nano Mechanical properties of Maganesuim alloy Tube[J]. Rare Metal Materials and Engineering,2018,47(5):1573~1577.]
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  • 收稿日期:2016-04-15
  • 最后修改日期:2016-07-01
  • 录用日期:2016-07-15
  • 在线发布日期: 2018-06-08
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