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Mg-8Li-4Al-0.3Y合金微觀組織與力學(xué)性能研究
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重慶大學(xué)材料科學(xué)與工程學(xué)院,重慶大學(xué)材料科學(xué)與工程學(xué)院,重慶大學(xué)材料科學(xué)與工程學(xué)院,重慶大學(xué)材料科學(xué)與工程學(xué)院,重慶大學(xué)材料科學(xué)與工程學(xué)院,重慶大學(xué)材料科學(xué)與工程學(xué)院

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TG146.2+2

基金項(xiàng)目:

國家重點(diǎn)研發(fā)計劃項(xiàng)目(2016YFB0700403); 重慶市基礎(chǔ)科學(xué)與前沿技術(shù)研究項(xiàng)目(cstc2016jcyjA0418); 中央高校基本科研業(yè)務(wù)費(fèi)(106112015CDJXY130011)


Research on Microstructure and Mechanical Properties of Mg-8Li-4Al-0.3Y Alloys
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College of Materials Science and Engineering,Chongqing University,College of Materials Science and Engineering,Chongqing University,College of Materials Science and Engineering,Chongqing University,College of Materials Science and Engineering,Chongqing University,College of Materials Science and Engineering,Chongqing University,College of Materials Science and Engineering,Chongqing University

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    摘要:

    利用光學(xué)顯微鏡(OM)、掃描電子顯微鏡(SEM)和X射線衍射儀(XRD)等手段系統(tǒng)研究了鑄態(tài)、固溶處理態(tài)和擠壓態(tài)Mg-8Li-4Al-0.3Y合金的微觀組織，測試了其室溫力學(xué)性能。實(shí)驗(yàn)結(jié)果表明：鑄態(tài)實(shí)驗(yàn)合金主要由ɑ-Mg、β-Li、Al2Y和AlLi相以及MgAlLi2相組成；固溶處理后合金中在相界處分布的MgAlLi2化合物相消失，大量AlLi相發(fā)生分解并固溶于合金基體中，僅剩下部分尺寸較大的AlLi相。在擠壓過程中合金發(fā)生動態(tài)再結(jié)晶，顯微組織明顯細(xì)化，組織更加均勻。固溶處理后合金基體硬度明顯高于鑄態(tài)合金；與鑄態(tài)相比，擠壓態(tài)合金的綜合力學(xué)性能得到大幅提升，其抗拉強(qiáng)度和延伸率分別達(dá)到208 MPa和25.1%。

    Abstract:

    The microstructure and mechanical properties of as-cast, solution-treated and as-extruded Mg-8Li-4Al-0.3Y alloys were studied by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction analysis (XRD) and tensile tests machines, etc. The results show that as-cast Mg-8Li-4Al-0.3Y alloys are composed of ɑ-Mg, β-Li, Al2Y, AlLi and MgAlLi2 phases. MgAlLi2 compound and most of AlLi phase decomposes and dissolves into the matrix, only part of larger AlLi particles are left during the solution treatment. The micro-hardness of solution-treated alloy is much higher than that of as-cast one due to solution strengthening. The mechanical properties of Mg-8Li-4Al-0.3Y alloys are improved a lot by extrusion and the ultimate strength and elongation of the extrude alloy reaches to 208 MPa and 25.1% respectively.

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楊艷,張雪平,任鳳娟,彭曉東,謝衛(wèi)東,張振宇. Mg-8Li-4Al-0.3Y合金微觀組織與力學(xué)性能研究[J].稀有金屬材料與工程,2018,47(8):2518~2524.[Yang Yan, Zhang Xueping, Ren Fengjuan, Peng Xiaodong, Xie Weidong, Zhang Zhenyu. Research on Microstructure and Mechanical Properties of Mg-8Li-4Al-0.3Y Alloys[J]. Rare Metal Materials and Engineering,2018,47(8):2518~2524.]
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  • 收稿日期:2016-08-01
  • 最后修改日期:2016-10-13
  • 錄用日期:2016-10-18
  • 在線發(fā)布日期: 2018-10-17
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