Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第5期    总第230期    2018年5月

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文章编号:1004-0609(2018)-05-0916-07
不同锰添加剂对Mg-3%Al合金显微组织的影响
石裕同,杜 军,黄正阳,李文芳

(华南理工大学 材料科学与工程学院,广州 510640)

摘 要: 采用光学和扫描电子显微镜研究了3种添加剂Mg-10Mn、Al-20Mn和MnCl2对Mg-3Al%合金组织的影响,利用相提取技术分析不同锰添加剂下Mg-3%Al(质量分数)合金中生成的Al-Mn相,并通过边边匹配模型对Al-Mn相和α-Mg间的晶体学错配度进行计算。结果表明:不同锰添加剂对Mg-3%Al合金晶粒和Al-Mn相类型有显著影响。Mg-10Mn和Al-20Mn中间合金在Mn加入量为0.3%时,对Mg-3%Al合金晶粒有一定的细化作用,而MnCl2导致晶粒显著粗化。Mn加入量为0.3%时,添加Mg-10Mn和Al-20Mn中间合金形成的Al-Mn相主要为Al8Mn5;而Mn量增至0.5%时,添加Mg-10Mn和Al-20Mn中间合金形成的Al-Mn相则主要为Al0.89Mn1.11。添加MnCl2时,Mg-3Al%合金中形成的Al-Mn相主要为Al10Mn3。晶体学错配度计算表明:Al8Mn5能充当Mg-3%Al合金的异质形核核心,但形核效率一般,Al0.89Mn1.11和Al10Mn3不能充当异质形核核心。

 

关键字: Mg-3Al%合金;晶粒细化;锰添加剂;相提取;边边匹配模型

Effects of different manganese additions on microstructure of Mg-3%Al alloy
SHI Yu-tong, DU Jun, HUANG Zheng-yang, LI Wen-fang

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

Abstract:The effects of three kinds of manganese additions on microstructure of the Mg-3Al% alloy were studied by optical microstructure and scanning electron microscope. The phase extracting method was utilized to analyze the Al-Mn phases generated in Mg-3Al% alloy modified by different manganese additions. The crystallography misfits between Al-Mn phases and α-Mg were calculated by using edge-to-edge matching model. The results show that different manganese additions can obtain different grain refinement efficiency and Al-Mn phases for the Mg-3Al% alloy. The grain size of the alloy can be slightly refined by Mg-10Mn and Al-20Mn master alloys when Mn addition is 0.3%. However, the grain is obviously coarsened after being modified by MnCl2. The Al-Mn phase generated in the alloy modified by Mg-10Mn and Al-20Mn master alloys mainly contains Al8Mn5 when Mn addition is 0.3%. And the Al-Mn phase turns to be Al0.89Mn1.11 when Mn addition is 0.5%. When the alloy is modified by MnCl2, the Al-Mn phase is mainly Al10Mn3. The crystallography misfit results show that Al8Mn5 can act as crystallize nuclei with impotent effect. Al0.89Mn1.11and Al10Mn3 cannot act as crystallize nuclei. The results correspond with the grain refinement efficiency of Mg-3Al% alloy modified by different Mn additions.

 

Key words: Mg-3Al% alloy; grain refinement; manganese addition; phase extraction; edge-to-edge matching model

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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