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La、Zr微合金化對Al-5Mg-0.2Ti合金微觀組織和力學(xué)性能的影響
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南昌航空大學(xué),南昌航空大學(xué),哈爾濱工業(yè)大學(xué),南昌航空大學(xué),南昌航空大學(xué),南昌航空大學(xué)

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TG 146.2

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國家自然科學(xué)基金(51165038，51201087); 省教育廳科技計劃項目(GJJ13496, GJJ12453 ); 航空科學(xué)基金(2011ZE56005); 南昌航空大學(xué)研究生創(chuàng)新基金項目(YC2013005)


Effect of La, Zr micro-alloying on the microstructure and mechanical properties of Al-Mg-Zr alloy
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nanchang hangkong university,Nanchang Hangkong University,Harbin Institute of Technology,anchang Hangkong University,anchang Hangkong University,Nanchang Hangkong University

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    摘要:

    采用鑄錠冶金法制備了含稀土La和Zr的Al-Mg-Ti合金，通過力學(xué)性能測試及金相顯微鏡、掃面電鏡、能譜和X射線衍射，觀察分析了La、Zr微合金化對Al-Mg-Ti合金微觀組織和力學(xué)性能的影響。結(jié)果表明，添加0.2%Zr能有效細(xì)化Al-Mg-Ti合金晶粒，說明Ti、Zr的細(xì)化作用是相容的，同時基體中析出的脆硬相Al3Zr能顯著提高合金硬度，但弱化了晶粒細(xì)化對合金強度和塑性的影響。0.2%La和0.2%Zr復(fù)合添加時的細(xì)化效果更為顯著，合金的平均晶粒尺寸僅為55祄，同時La的添加有效避免了脆硬相Al3Zr的析出和粗化，使合金的強度和塑性都得到了顯著的提高，而硬度變化較小。

    Abstract:

    Al-Mg-Ti alloys containing La, Zr elements were prepared by cast metallurgy. Effects of La, Zr additions on microstructure and mechanical properties of Al-Mg-Ti alloy were investigated by property test, optical microscopy, scanning electron microscopy, energy spectrum and X-ray diffraction. The results show that the addition of 0.2%Zr can positively refine the grain size，which indicates the composite refining effect of Ti, Zr is compatible，and the brittle phases of Al3Zr precipitated in matrix can significantly increase the hardness of the alloys, but weaken the effect of grain refinement on the strength and ductility of the alloy. The combined addition of 0.2%La and 0.2%Zr possesses the most excellent grain refining effect, the average grain size of the alloy is dropped to only about 55μm and the addition of La can effectively avoid the precipitation and coarsening of brittle phase of Al3Zr, which makes the strength and ductility of the alloy improved significantly, and makes the hardness increased little.

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余愛武,楊成剛,何鵬,劉奮成,王善林,陳和. La、Zr微合金化對Al-5Mg-0.2Ti合金微觀組織和力學(xué)性能的影響[J].稀有金屬材料與工程,2016,45(3):760~764.[yuaiwu, Yang Chenggang, He Peng, Liu Fencheng, Wang Shanlin, Chen He. Effect of La, Zr micro-alloying on the microstructure and mechanical properties of Al-Mg-Zr alloy[J]. Rare Metal Materials and Engineering,2016,45(3):760~764.]
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  • 收稿日期:2014-04-14
  • 最后修改日期:2014-10-09
  • 錄用日期:2014-11-20
  • 在線發(fā)布日期: 2016-07-07
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