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Heat Resistant Mg-Al-Sr Alloys with High Electrical Conductivity
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    Abstract:

    Mg-3Al-xSr (x=0.1~0.9 wt%) alloys were prepared by a traditional cast method. Microstructures, electrical conductivities and micro-hardness of the present alloys in as-cast and as-heat treated states were studied by means of optical microscope, SEM, XRD, electrical conductivity meter and micro-hardness measuring instruments. The results show that Al4Sr phase is formed with little addition of Sr (<0.1 wt%). With increasing content of Sr, the electrical conductivity of as-cast Mg-Al-Sr alloys increases, and Mg-Al-Sr ternary phase (τ phase) is formed. After high temperature heat treatment at 400 oC, τ phase would decompose to Al4Sr phase, and the corresponding electrical conductivity of Mg-Al-Sr alloys increases with the heating time increasing. Vickers hardness of the as-cast alloy decreases slightly with a small amount of Sr addition (<0.1 wt%). With the increasing content of Sr (>0.1 wt%), the hardness of the alloys increases first, reaching the peak hardness at 0.6 wt% Sr and then decreases. Moreover, the high temperature treatment would decrease the corresponding hardness for as-cast alloys.

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[Pan Hucheng, Pan Fusheng, Zhang Lei, Peng Jian, Wu Lu, Lü Binjiang, Huang Meina, Zhao Chaoyong. Heat Resistant Mg-Al-Sr Alloys with High Electrical Conductivity[J]. Rare Metal Materials and Engineering,2015,44(3):727~732.]
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History
  • Received:March 18,2014
  • Revised:
  • Adopted:
  • Online: May 29,2015
  • Published: