17Al12相和Mg2Sn相。在添加Zn元素以后,合金中的共晶化合物的形態(tài)發(fā)生變化,由共晶組織變?yōu)殡x異共晶組織。擠壓過后,晶粒組織尺寸更均勻。Zn元素的加入,會促進(jìn)合金中第二相在擠壓過程中的動態(tài)析出以及第二相尺寸的粗化。合金在時效中產(chǎn)生的析出相的數(shù)量也隨著Zn含量的增多而增加。隨著Zn含量的增加,擠壓態(tài)和時效態(tài)合金的屈服強(qiáng)度和抗拉強(qiáng)度都隨之增加。當(dāng)Zn含量達(dá)到2 wt.%時,合金力學(xué)性能最好,其時效態(tài)的抗拉強(qiáng)度,屈服強(qiáng)度和延伸率分別是385 MPa, 291 MPa和6.44%。"/>

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Zn添加對Mg-8Al-2Sn鎂合金組織和性能的影響
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重慶大學(xué)

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國家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）,國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）,國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目


Effects of Zn Addition on the Microstructure and Mechanical Properties of Mg-8Al-2Sn Alloy
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Chongqing University

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National Great Theoretic Research Project (2013CB632200); National Natural Science Foundation of China (51571040 and 51531002); National Great Engineering Research Project (2016YFB0301101)

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    摘要:

    本文以Mg-8Al-2Sn變形鎂合金為研究背景,通過在Mg-8Al-2Sn合金中添加0-2 wt.%含量的Zn元素,研究了Zn添加對Mg-8Al-2Sn擠壓鎂合金顯微組織和性能的影響。研究結(jié)果表明,鑄態(tài)Mg-8Al-2Sn-xZn合金的相組成主要是α-Mg相、Mg17Al12相和Mg2Sn相。在添加Zn元素以后,合金中的共晶化合物的形態(tài)發(fā)生變化,由共晶組織變?yōu)殡x異共晶組織。擠壓過后,晶粒組織尺寸更均勻。Zn元素的加入,會促進(jìn)合金中第二相在擠壓過程中的動態(tài)析出以及第二相尺寸的粗化。合金在時效中產(chǎn)生的析出相的數(shù)量也隨著Zn含量的增多而增加。隨著Zn含量的增加,擠壓態(tài)和時效態(tài)合金的屈服強(qiáng)度和抗拉強(qiáng)度都隨之增加。當(dāng)Zn含量達(dá)到2 wt.%時,合金力學(xué)性能最好,其時效態(tài)的抗拉強(qiáng)度,屈服強(qiáng)度和延伸率分別是385 MPa, 291 MPa和6.44%。

    Abstract:

    The effect of adding 0-2.0 wt.% Zn to the Mg-8Al-2Sn alloy was investigated by analyzing the microstructures and tensile properties. The results revealed that the phase compositions of Mg-8Al-2Sn-xZn alloys are α-Mg, Mg17Al12 and Mg2Sn phases. The morphology of eutectic phases of the as-cast alloys was changed from normal eutectic to divorced eutectic with Zn addition. Grain sizes of the alloys were uniform after hot extrusion with Zn addition. Dynamic precipitation of the second phases was promoted by the addition of Zn during hot extrusion. The second phases coarsened in Mg-8Al-2Sn-2Zn alloy. Precipitates formed during the aging treatment and the amount of which increased with the addition of Zn content. Besides, the ultimate tensile and yield strength of the extruded and aged alloys gradually increased with the addition of Zn content. The results showed that Mg-8Al-2Sn-2Zn alloy has the best mechanical property that the ultimate tensile strength, yield strength and elongation of the as-aged alloy were 385 MPa, 291 MPa and 6.44%, respectively.

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伍華怡,張丁非,蔣璐瑤,馮靖凱,趙陽,潘復(fù)生. Zn添加對Mg-8Al-2Sn鎂合金組織和性能的影響[J].稀有金屬材料與工程,2019,48(7):2091~2198.[Wu Huayi, Zhang Dingfei, Jiang Luyao, Feng Jingkai, Zhao Yang, Pan Fusheng. Effects of Zn Addition on the Microstructure and Mechanical Properties of Mg-8Al-2Sn Alloy[J]. Rare Metal Materials and Engineering,2019,48(7):2091~2198.]
DOI：10.12442/j. issn.1002-185X.20180102

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  • 收稿日期:2018-01-26
  • 最后修改日期:2019-06-17
  • 錄用日期:2018-04-04
  • 在線發(fā)布日期: 2019-08-01
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