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| 1 | 复合碳变质剂对AZ91D镁合金的晶粒细化作用显示文摘采用OM、SEM、EDS、XRD等研究复合变质剂组成对AZ91D镁合金铸态和固溶态组织的影响,并分析晶粒细化作用机理。结果表明,适当加入三元复合碳变质剂可使AZ91D镁合金的晶粒尺寸显著减小,在相同的实验条件下,当3种碳化物组分Mg CO3、Si C、C2Cl6的质量比为3:1:1时,能够获得最好的细化效果。一方面,Mg CO3、C2Cl6在熔体中分解出的C与Al发生原位反应,生成的大量Al4C3颗粒均匀分散到熔体中,直接成为α-Mg的形核核心;另一方面,在α-Mg晶体生长过程中部分细小的Al4C3颗粒与Si C颗粒一起被固液界面推移至晶界,起到阻碍晶体长大作用,使α-Mg晶粒得到有效细化。 | 卢敏敏 李克 吴尚敏 周耐根 曾效舒 | 2015 | 中国有色金属学报2015，25，4： | 2 |
| 2 | The Combined Effects of Electromagnetic Stirring and Al-5C Master Alloy on Grain Refinement of AZ31 Magnesium Alloy显示文摘A1-5wt.%C(similarly hereinafter)master alloy as a refiner has been developed by powder in situ synthesis process,and the combined effects of Al-5C refiner and EMS(electromagnetic stirring)on grain refinement of AZ31 alloy are investigated.The results indicate that the A1-5C refiner and EMS can remarkably reduce the grain size of AZ31 alloy.The average grain size of AZ31 alloy decreased firstly and then increased with the increasing addition amount of the A1-5C master alloy,and the optimum addition amounts is 2wt.%.While the AZ31 alloy with 3wt.%Al-5C master alloy solidified under EMS,the average grain size further reduced and is less than that treated only by EMS.The refining mechanism of AZ31 alloy refined by Al-5C master is owing to the polygonal Al_8(Mn,Fe)_5 particles acting as nucleating substrates forα-Mg grain.The more distribution of Al_8(Mn,Fe)_5 and AlaC3 particles generated by EMS contribute to the further refinement when treated by combining with A1-5C refiner. | ZHANG Ai-min HAO Hai LI Ming ZHANG Xing-guo | 2012 | Journal of Iron and Steel Research(International)2012，19，S1： | 0 |
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