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Effect of Ca impurity on microstructures and mechanical properties of as-cast Al-5Mg filler metalsT
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State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering,State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering,State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering,State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering,State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering

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TG422

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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.

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[Lu Quanbin, Shen Yuanxun, Zhong Sujuan, Zhao Chenfeng, 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.]
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History
  • Received:June 02,2016
  • Revised:July 29,2016
  • Adopted:August 18,2016
  • Online: September 06,2018
  • Published: