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ZM81-xSn (x = 0, 2, 4, 6, 8 and 10)變形鎂合金的組織演變和力學性能
作者:
作者單位:

1.電網(wǎng)輸變電設備防災減災國家重點實驗室;2.湘潭大學材料科學與工程學院;3.重慶大學材料科學與工程學院

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中圖分類號:

TG146.2

基金項目:

國家自然科學基金青年科學基金項目（51701172）；湖南省自然科學基金青年基金項目（2018JJ3504）；中國博士后科學基金資助項目（2018M632977）；輸變電設備防災減災國家重點實驗室開放基金項目（2016ZKFW127）


Microstructure evolution and mechanical properties of ZM81-xSn (x = 0, 2, 4, 6, 8 and 10) wrought magnesium alloys
Author:
Affiliation:

1.State Key Laboratory of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equipment;2.School of Materials Science and Engineering,Xiangtan University;3.College of Materials Science and Engineering,Chongqing University

Fund Project:

National Natural Science Foundation of China (51701172); Natural Science Foundation of Hunan Province (2018JJ3504); China Postdoctoral Science Foundation (2018M632977); State Key Laboratory opening foundation of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equip-ment(2016ZKFW127).

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    摘要:

    通過對不同Sn含量的ZM81合金的微觀組織和力學性能的測得，研究了Sn在ZM81合金中的存在形式和作用機制及不同添加量對合金顯微組織和力學性能的影響。研究結果表明：Sn元素主要以Mg2Sn共晶相形式存在，能夠細化鑄態(tài)組織；熱擠壓過程中，Sn添加能夠起到抑制動態(tài)再結晶和晶粒細化的作用；T6處理，尤其是雙級時效，能顯著提升擠壓態(tài)合金的力學性能，其中ZM81-4Sn合金具有最佳的綜合力學性能，抗拉強度、屈服強度和延伸率分別為416MPa、393MPa和4.1%。實驗合金高強度主要源于MgZn2和Mg2Sn析出相的雙重時效強化效果；相比單級時效，雙級時效態(tài)合金的析出相細小彌散，因此其力學性能更優(yōu)。

    Abstract:

    The microstructure and mechanical properties of the ZM81 alloys with varying Sn contents subjected to the extrusion and T6 treatments were investigated by OM, XRD, SEM, TEM, hardness test and uniaxial tensile test at room temperature, respectively. The results show that after the addition of Sn element, an Mg2Sn eutectic phase is formed, which can refine the as-cast microstructure. Sn element has an obvious effect on refining the microstructure of as-extruded alloys by restricting the occurrence of dynamic recrystallization and restraining the grain growth during extrusion, and improves the mechanical properties. T6 treatments, especially double aging, can significantly increase the strengths of the extruded alloys. Among them, the ZM81-4Sn alloy with double aging exhibits an ultimate tensile strength of 416MPa, a 0.2% yield strength of 393MPa and an elongation of 4.1%. The microstructure characterization suggests that the high strengths of the peak-aged alloys are attributed to the combined precipitation strengthening of the fine and dispersed MgZn2 and Mg2Sn precipitates, and the pre-cipitates after double peak aging are finer than those after single peak aging.

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引用本文

齊福剛,羅文忠,吳傳平,趙鎳,葉芝松,侯彩紅,張丁非. ZM81-xSn (x = 0, 2, 4, 6, 8 and 10)變形鎂合金的組織演變和力學性能[J].稀有金屬材料與工程,2020,49(3):778~786.[Qi Fugang, Luo Wenzhong, Wu Chuanping, Zhao Nie, Ye Zhisong, Hou Caihong, Zhang Dingfei. Microstructure evolution and mechanical properties of ZM81-xSn (x = 0, 2, 4, 6, 8 and 10) wrought magnesium alloys[J]. Rare Metal Materials and Engineering,2020,49(3):778~786.]
DOI：10.12442/j. issn.1002-185X.20181049

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  • 收稿日期:2018-10-15
  • 最后修改日期:2018-12-18
  • 錄用日期:2019-01-09
  • 在線發(fā)布日期: 2020-04-08
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