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Microstructure and Mechanical Properties of Mg-12Al- 0.7Si Magnesium Alloy Processed by Equal Channel Angular Pressing
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Microstructure and Mechanical Properties of Mg-12Al- 0.7Si Magnesium Alloy Processed by Equal Channel Angular Pressing
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National Natural Science Foundation of China（51175363）

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    摘要:

    研究了Mg-12Al-0.7Si鎂合金在等通道轉角擠壓過程中微觀組織與力學性能隨著擠壓道次的變化行為。結果表明，隨著擠壓道次的增加，基體晶粒不斷細化。6道次細化效果最佳，從鑄態(tài)約90 μm細化至約8 μm，連續(xù)網(wǎng)狀分布的β-Mg17Al12相被擠碎至約4 μm，漢字狀Mg2Si相破碎且趨于均勻分布，8道次擠壓后平均尺寸為2~3 μm。室溫抗拉強度和伸長率在6道次和8道次擠壓后達到最高，分別為293 MPa和5.1%。高溫抗拉強度和伸長率在2道次和6道次擠壓后最佳，分別為204 MPa和34.4%?；?0002)晶面取向隨擠壓道次增加而逐漸增強，形成基面變形織構

    Abstract:

    Equal-channel angular pressing (ECAP) experiments were conducted on a Mg-12Al-0.7Si magnesium alloy to investigate the influence of extrusion pass on its microstructure and mechanical properties. Homogeneously refined grains and secondary Mg17Al12 particles have been observed after multiple pass ECAP processing at 573 K. Mg2Si phase with size of about 2~3 μm has been observed after 8-pass ECAP processing; its morphology changes from initial coarse Chinese script shape to fine granule polygonal shape and its distribution tends to dispersing. The ultimate strength and the elongation of the alloy at room temperature remarkably increase to 293 MPa (after 6-pass processing) and 5.1% (after 8-pass processing), respectively. During the high temperature (200 °C) test, 2-pass processed specimen exhibits high strength of 204 MPa, and the 6-pass processed specimen has better elongation of 34.4%. The high strength of ECAPed alloy is attributed to grain refinement and modification of the second phase during ECAP, especially the Mg2Si phase. It is also shown that the basal plane texture (0002) developed by repetitive ECAP pressing influences the mechanical behavior of the ECAP-processed alloy

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龔家林,梁 偉,王紅霞,趙興國,邊麗萍. Microstructure and Mechanical Properties of Mg-12Al- 0.7Si Magnesium Alloy Processed by Equal Channel Angular Pressing[J].稀有金屬材料與工程,2013,42(9):1800~1804.[Gong Jialin, Liang Wei, Wang Hongxia, Zhao Xingguo, Bian Liping. Microstructure and Mechanical Properties of Mg-12Al- 0.7Si Magnesium Alloy Processed by Equal Channel Angular Pressing[J]. Rare Metal Materials and Engineering,2013,42(9):1800~1804.]
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  • 收稿日期:2012-09-21
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