17Al12相組成。加入Si后,合金中出現(xiàn)了新相Mg2Si,晶粒得到了明顯細(xì)化；當(dāng)合金中的Si含量過高時,α-Mg相粗化,且會在相界處出現(xiàn)塊狀和漢字狀的Mg2Si相。合金的強度隨著Si含量的增加呈現(xiàn)先增加后降低的趨勢,合金的延伸率隨著Si含量的增加呈現(xiàn)逐漸降低的趨勢。當(dāng)合金中Si含量為0.1%時,抗拉強度達(dá)到最大值182.5MPa,延伸率為12.1%,相比未添加Si的Mg-9Li-3Al合金,抗拉強度提高了59.6%。"/>

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鑄態(tài)Mg-Li-Al-xSi合金微觀組織和力學(xué)性能
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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,重慶大學(xué)

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中央高校基本科研業(yè)務(wù)費


Microstructure and mechanical properties of as-cast Mg-Li-Al-xSi 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:

    本文通過真空熔煉爐在氬氣保護(hù)下制備了Mg-9Li-3Al-xSi(x=0,0.1,0.5,1.0 wt%)合金。實驗使用光學(xué)顯微鏡(OM),掃描電子顯微鏡(SEM),力學(xué)性能測試和X射線衍射(XRD)研究合金的微觀組織和力學(xué)性能。實驗結(jié)果表明：鑄態(tài)Mg-9Li-3Al合金組織中主要由α-Mg、β-Li、Mg17Al12相組成。加入Si后,合金中出現(xiàn)了新相Mg2Si,晶粒得到了明顯細(xì)化；當(dāng)合金中的Si含量過高時,α-Mg相粗化,且會在相界處出現(xiàn)塊狀和漢字狀的Mg2Si相。合金的強度隨著Si含量的增加呈現(xiàn)先增加后降低的趨勢,合金的延伸率隨著Si含量的增加呈現(xiàn)逐漸降低的趨勢。當(dāng)合金中Si含量為0.1%時,抗拉強度達(dá)到最大值182.5MPa,延伸率為12.1%,相比未添加Si的Mg-9Li-3Al合金,抗拉強度提高了59.6%。

    Abstract:

    The as-cast Mg-9Li-3Al-xSi(x=0,0.1,0.5,1.0 wt%)alloys were prepared in a vacuum induction furnace with the protection of argon. The alloys were then investigated by OM,SEM,XRD and mechanical properties test. Results exhibit that the as-cast Mg-9Li-3Al-xSi alloys are consist of α-Mg, β-Li, Mg17Al12 and phase. The addition of Si leads to the formation of new phase (Mg2Si) and the refinement of the grain. But if the content of Si is too high, α-Mg phase will coarsened, there are block and Chinese character shaped Mg2Si phase existing in the phase boundary. The temsile strength of alloys initially enhance and then decrease while the elongation declines with the increase of Si content. When Si addition is 0.1wt%, the tensile strength of the alloy comes to the maximum of 182.5Mpa, enhanced by 59.6% compared to the Mg-9Li-3Al alloy, while the elongation is 12.1%.

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張振宇,彭曉東,顏磊,李楊敏,麻毅,李孟孿,楊艷.鑄態(tài)Mg-Li-Al-xSi合金微觀組織和力學(xué)性能[J].稀有金屬材料與工程,2017,46(8):2055~2059.[Zhang Zhenyu, Peng Xiaodong, Yan Lei, Li Yangmin, Liu Junwei, Li Mengluan, yangyan. Microstructure and mechanical properties of as-cast Mg-Li-Al-xSi alloys[J]. Rare Metal Materials and Engineering,2017,46(8):2055~2059.]
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  • 收稿日期:2015-06-18
  • 最后修改日期:2015-09-15
  • 錄用日期:2015-10-13
  • 在線發(fā)布日期: 2017-11-16
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