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路全彬,沈元勋,钟素娟,赵辰丰,龙伟民.杂质Ca对Al-5Mg填充合金凝固组织及力学性能的影响[J].稀有金属材料与工程(英文),2018,47(6):1739~1743.[Lu Quanbin,Shen Yuanxun,Zhong Sujuan,Zhao Chenfeng and Long Weimin.Effect of Ca impurity on microstructures and mechanical properties of as-cast Al-5Mg filler metalsT[J].Rare Metal Materials and Engineering,2018,47(6):1739~1743.]
Effect of Ca impurity on microstructures and mechanical properties of as-cast Al-5Mg filler metalsT
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Received:June 02, 2016  Revised:July 29, 2016
DOI:
Key words: Al-5Mg  filler metal, Ca  content, microstructures, mechanical  properties
Foundation item:国家国际科技合作计划项目 (2015DFA50470); 华南理工大学国家金属材料近净成形工程技术研究中心开放基金项目(2013001).
Author NameAffiliation
Lu Quanbin,Shen Yuanxun,Zhong Sujuan,Zhao Chenfeng and Long Weimin  
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Abstract:
      Effects of Ca impurity on microstructures and mechanical properties of Al-5Mg filler metals were investigated with SEM, EDS, XRD, tensile test and impact test. The results indicate that the phase composition of Al-5Mg alloy is changed by the Ca impurity. It is observed that block-like (Ti,Cr)2Ca(Al,Mg)20 phase distributed discontinuously along the grain boundaries when the Ca content is less than 0.28%. When the content of Ca is over 0.28%, bar-like Al2Ca and block-like (Ti,Cr)2Ca(Al,Mg)20 combine together and distribute along the grain boundaries, and the amount and size of Ca-rich phase (both the bar-like and block-like) increase with the Ca content. Tensile strength of the Al-5Mg alloys increases firstly and then decreases with increasing Ca content, and the tensile strength gets to maximum value when the content of Ca is 0.28 wt%. The plasticity and fracture toughness decrease smoothly (Ca 0-0.28%) but then significantly (Ca>0.28%), and the tensile or impact fracture mode transform from the transgranular ductile fracture to the brittle cleavage fracture.