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Microstructures and Mechanical Properties of Mg-2Y-xZn (x=1, 2, 3 at%) Alloys
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Microstructures and Mechanical Properties of Mg-2Y-xZn (x=1, 2, 3 at%) Alloys
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Jiangsu Natural Science Foundation (BK2010392); Innovation Foundation of Southeast University (3212000502)

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    摘要:

    研究了Mg-2Y-xZn (x = 1, 2, 3 at%)合金在鑄態(tài)、退火態(tài)和擠壓態(tài)的顯微組織與力學(xué)性能。結(jié)果表明：隨著合金中Zn含量的增加，合金顯微組織中第二相依次為18R-LPSO相、（LPSO + W）混合物和W相。在退火過程中，層片狀的14H-LPSO結(jié)構(gòu)析出并沿塊狀18R-LPSO結(jié)構(gòu)向基體中生長，W相由鑄態(tài)時彎曲的條紋狀轉(zhuǎn)變?yōu)轭w粒狀。經(jīng)過擠壓變形后，LPSO結(jié)構(gòu)和W相均沿擠壓方向排列，合金性能得到大幅度提高，其中Mg-2Y-1Zn合金具有最好的室溫力學(xué)性能，抗拉強度為320 MPa，延伸率達到11.2%

    Abstract:

    The microstructures and the mechanical properties of the Mg-2Y-xZn (x = 1, 2, 3 at%) alloys in as-cast, as-annealed and as-extruded conditions have been investigated. The results show that the 18R-LPSO phases are distributed in a continuous network mainly along the grain boundaries in the alloy with 1 at% Zn. With increasing of Zn content, the 18R-LPSO phase and W-phase coexist in Mg-2Y-2Zn alloy but only W-phase remains in Mg-2Y-3Zn alloy. The 14H-lamellas are precipitated from the block-shaped 18R-LPSO phases into the matrix, and W-phases are broken into particles during homogenizing annealing. After extrusion, the LPSO phases and W-particles are rearranged along the direction of extrusion. The tensile tests show that the as-extruded Mg-2Y-1Zn alloy exhibits the supreme UTS of 320 MPa, with an elongation of 11.2% at room temperature

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劉 歡,薛 烽,白 晶,周 健,孫揚善. Microstructures and Mechanical Properties of Mg-2Y-xZn (x=1, 2, 3 at%) Alloys[J].稀有金屬材料與工程,2014,43(3):570~574.[Liu Huan, Xue Feng, Bai Jing, Zhou Jian, Sun Yangshan. Microstructures and Mechanical Properties of Mg-2Y-xZn (x=1, 2, 3 at%) Alloys[J]. Rare Metal Materials and Engineering,2014,43(3):570~574.]
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  • 收稿日期:2013-03-15
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  • 在線發(fā)布日期: 2014-06-27
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