微量Fe对Mg-3%Al合金碳质孕育衰退的影响

doi:10.11868/j.issn.1001-4381.2016.05.009

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摘要

对含微量Fe的Mg-3%Al合金进行碳质孕育处理,并调整保温时间,研究了保温时间对合金晶粒尺度和晶核组织特征的影响。结果表明:当保温时间在20min内时,合金组织中有效形核粒子主要以Al₄C₃和Al₄C₃表层包覆Al-(C)-Fe相的双相粒子为主,合金晶粒得到细化。但随保温时间进一步延长,因沉降聚集或结构变化使得有效形核粒子数量和比例逐渐下降,合金晶粒显著粗化,产生孕育衰退。

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	王明华
	杜军

关键词 ： Mg-Al合金, 碳质孕育, 晶粒细化, 孕育衰退

Abstract：

Mg-3%Al alloy containing trace 0.1%Fe was inoculated by carbon. The carbon-inoculated Mg-3%Al-0.1%Fe melt was held for different time after inoculation to study the effect of holding time on grain size and characteristic of carbonaceous nuclei. The results show that when the holding time is within 20min, there mainly exist Al₄C₃ particles and the particles with duplex phase structure of Al₄C₃ coated on Al-(C)-Fe in the samples. The number of particles of Al₄C₃ and Al₄C₃ coated on Al-(C)-Fe decreases with the increase of holding time due to aggregation, settlement and structure change of the potent nuclei. Consequently, the grains become coarse and inoculation fading occurs.

Key words： Mg-Al alloy carbon inoculation grain refinement inoculation fading

收稿日期: 2015-05-13 出版日期: 2016-05-19

中图分类号:

TG146.2+2

基金资助:国家自然科学基金(50901034);华南理工大学中央高校基金(2012ZZ0005)

通讯作者: 杜军 E-mail: tandujun@sina.com

作者简介: 杜军(1975-),男,教授,博士,研究方向:轻合金强化及其表面改性,联系地址:广东省广州市天河区华南理工大学材料科学与工程学院金属系(510640),E-mail:tandujun@sina.com

引用本文:

王明华, 杜军. 微量Fe对Mg-3%Al合金碳质孕育衰退的影响[J]. 材料工程, 2016, 44(5): 54-58.
Ming-hua WANG, Jun DU. Influence of Trace Fe on Fading of Mg-3%Al Alloy Inoculated by Carbon. Journal of Materials Engineering, 2016, 44(5): 54-58.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.05.009 或 http://jme.biam.ac.cn/CN/Y2016/V44/I5/54

Fig.1 Mg-3%Al-0.1%Fe合金碳质孕育后经不同保温时间的金相组织 (a)未孕育；(b)5min；(c)20min；(d)60min

Fig.2 保温时间对碳质孕育Mg-3%A-0.1%Fe合金晶粒尺寸的影响

Fig.3 碳质孕育后保温5min样品的EPMA观测与分析 (a) BSE电子像；(b) 区域A及粒子B，C，D的放大像；(c)区域A中EF线上Mg,Al,C,O和Fe元素的EPMA分析；(d)图(b)中谱A的EDS分析；(e)图(b)中谱B的EDS分析；(f)图(b)中谱C的EDS分析

Fig.4 碳质孕育后保温20min样品的EPMA观测 (a)BSE电子像；(b)区域A,B的放大像

Fig.5 碳质孕育保温60min样品的EPMA观测与分析 (a)背散射电子像；(b)粒子A的放大像；(c)粒子A的EDS谱图

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