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Al和Li含量不同的時效態(tài)Mg-Gd-Zn-Zr-Ag合金的組織和力學性能
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重慶大學 輕合金國際聯(lián)合實驗室教育部

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國家重點研發(fā)項目(2016YFB0301100);國家自然科學基金(51571043);中央高?；A(chǔ)研究基金(2018CDJDCL0019、cqu2018CDHB1A08、2018CDGFCL0005)


Microstructure and mechanical properties of as-aged Mg-Gd-Zn-Zr-Ag alloy with different contents of Al and Li
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The National Key Technologies R&D Program of China;National Natural Science Foundation of China ;Fundamental Research Funds for the Central Universities

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    摘要:

    研究了不同鋁和鋰元素含量的Mg-12Gd-1Zn-0.5Zr-0.5Ag (wt.%)合金經(jīng)T6熱處理后的組織演變和力學性能。結(jié)果表明, T6熱處理后，有新的Mg3Gd顆粒從Mg-12Gd-1Zn-0.5Zr-0.5Ag合金中析出，且 Mg-12Gd-4Al-3Li-1Zn-0.5Zr-0.5Ag 和 Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag合金中的大多數(shù)Al2Li3相變得更細小，分布更均勻。時效態(tài)Mg-12Gd-4Al-3Li-1Zn-0.5Zr-0.5Ag 和 Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag合金中的晶粒尺寸和c/a比值相比時效態(tài)Mg-12Gd-1Zn-0.5Zr-0.5Ag alloy有顯著的降低，這有利于提高抗拉強度和塑性。時效態(tài)Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag合金結(jié)合了最佳的拉伸強度、彈性模量和塑性，其拉伸強度為210 MPa，彈性模量為50.7 GPa，延性率為24.8%。

    Abstract:

    In this work，the microstructure evolution and mechanical properties of Mg-12Gd-1Zn-0.5Zr-0.5Ag (in wt.%) alloys with different contents of Al and Li elements by T6 heat treatment were investigated. The results indicate that new Mg3Gd particles are precipitated in Mg-12Gd-1Zn-0.5Zr-0.5Ag alloy and most Al2Li3 phases in Mg-12Gd-4Al-3Li-1Zn-0.5Zr-0.5Ag and Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag alloys become smaller and more evenly distributed after T6 heat treatment. The grain size and c/a ratio values of the as-aged Mg-12Gd-4Al-3Li-1Zn-0.5Zr-0.5Ag alloy and Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag alloy are decreased significantly than that of as-aged Mg-12Gd-1Zn-0.5Zr-0.5Ag alloy, which results in improved tensile strength and plasticity. The best combination of tensile strength, elastic modulus and plasticity is as-aged Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag alloy, the ultimate tensile strength, modulus and ductility are 210 MPa, 50.7 GPa and 24.8%, respectively.

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涂 騰,陳先華,張利娟,趙超越,羅 鑄,代 言,潘復生. Al和Li含量不同的時效態(tài)Mg-Gd-Zn-Zr-Ag合金的組織和力學性能[J].稀有金屬材料與工程,2021,50(2):488~496.[Tu Teng, Chen Xianhua, Zhang Lijuan, Zhao Chaoyue, Luo Zhu, Dai Yan, Pan Fusheng. Microstructure and mechanical properties of as-aged Mg-Gd-Zn-Zr-Ag alloy with different contents of Al and Li[J]. Rare Metal Materials and Engineering,2021,50(2):488~496.]
DOI：10.12442/j. issn.1002-185X.20200064

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  • 收稿日期:2020-02-04
  • 最后修改日期:2020-05-11
  • 錄用日期:2020-05-27
  • 在線發(fā)布日期: 2021-03-09
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