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復(fù)合添加Sc、Zr、Ti對Al-Mg合金組織與性能的影響
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Effect of Minor Sc, Zr and Ti Co-Addition on Microstructure and Properties of Al-Mg Alloys
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    摘要:

    采用布氏硬度計(jì)、金相顯微鏡、掃描電鏡(SEM)和透射電鏡(TEM)研究了微量Sc、Zr、Ti以及Mg含量對Al-Mg合金的顯微組織與布氏硬度的影響。結(jié)果表明，單獨(dú)添加Sc、Zr元素的合金與未添加的Al-Mg合金的鑄態(tài)組織相比，合金的晶粒組織得到了一定的細(xì)化，復(fù)合添加Sc、Zr、Ti 3種元素的合金鑄態(tài)組織的晶粒細(xì)化程度更為明顯。同時在Sc、Zr、Ti相同含量下，Mg元素的增加也能進(jìn)一步細(xì)化合金的晶粒組織，這是由于Mg元素固溶強(qiáng)化的結(jié)果，使得合金的布氏硬度提高。對Al-10Mg-Sc-Zr-Ti合金進(jìn)行均勻化退火處理后，合金的硬度較鑄態(tài)組織提高了10%，這是Al3(Sc1-xZrx)、Al3(Sc1-xTix)及Al3(Sc1-x-yZrxTiy)大量沉淀相二次析出，彌散度增大、分布更加均勻的結(jié)果

    Abstract:

    Effect of minor Sc, Zr and Ti co-addition and Mg content on the microstructure and Brinell hardness of Al-Mg alloys was investigated by means of Brinell hardness tester, optical microscope, SEM and TEM. Results show that the grain size of the as-cast alloys was refined by the addition of Sc and Zr, and it can be further refined by the addition of Ti. With the same Sc, Zr and Ti content, the increase of Mg content is beneficial to the refinement of microstructure, which is due to the solid solution strengthening of Mg in α-Al. The refined microstructures of the as-cast alloys were favorable for the improvement of the Brinell hardness. After homogenization annealing treatment of Al-10Mg-Sc-Zr-Ti, the Brinell hardness of alloys increased by 10% owing to second precipitations of Al3(Sc1-xZrx), Al3(Sc1-xTix) and Al3(Sc1-x-yZrxTiy), increased dispersity and more homogeneous distribution

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王 旭,陳國欽,李 冰,武高輝,蔣大鳴.復(fù)合添加Sc、Zr、Ti對Al-Mg合金組織與性能的影響[J].稀有金屬材料與工程,2010,39(4):719~722.[Wang Xu, Chen Guoqin, Li Bing, Wu Gaohui, Jiang Daming. Effect of Minor Sc, Zr and Ti Co-Addition on Microstructure and Properties of Al-Mg Alloys[J]. Rare Metal Materials and Engineering,2010,39(4):719~722.]
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  • 收稿日期:2009-04-16
  • 最后修改日期:2010-01-12
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