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Volume 26 Issue 1
Aug.  2021
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Article Contents
LIU Huimin, HU Nusitu, CUI Hua, YANG Bin, ZHANG Jishan. Effect of the Volume Fraction of In-Situ TiC Particles on the Semi-Solid Micro-structure of Spray Formed 7075 Al Alloy[J]. Chinese Journal of Engineering, 2004, 26(1): 59-62. doi: 10.13374/j.issn1001-053x.2004.01.017
Citation: LIU Huimin, HU Nusitu, CUI Hua, YANG Bin, ZHANG Jishan. Effect of the Volume Fraction of In-Situ TiC Particles on the Semi-Solid Micro-structure of Spray Formed 7075 Al Alloy[J]. Chinese Journal of Engineering, 2004, 26(1): 59-62. doi: 10.13374/j.issn1001-053x.2004.01.017

Effect of the Volume Fraction of In-Situ TiC Particles on the Semi-Solid Micro-structure of Spray Formed 7075 Al Alloy

doi: 10.13374/j.issn1001-053x.2004.01.017
  • Received Date: 2003-04-01
  • The microstructure of in-situ reactive spray formed 7075+XTiC (the volume fraction X=0,1.15%, 1.73%, 2.91%, 4.48%, 5.95%) after heat treatment at 610℃ and 620℃ for 30min were observed using SEM. The grain size was measured by a mean linear intercept method to analyze the effect of different volume fractions of in-situ TiC particles on the semi-solid microstrucrure of spray formed 7075 alloy. It was shown that at 610℃ the pinning effect was significant when the volume fraction of in-situ TiC particles was up to 2.91%, which made micro-structures of the alloy keep as-spray formed characteristics and could meet the requirement of subsequent semi-solid processing. If that of in-situ TiC particles exceeded 2.91%, the grain size was further decreased, but the number of dispersoids and particles at grain boundaries evidently increased with net-shaped distribution. When that was less than 2.91%, the grain grew abnormally at local areas, resulting in the homogenization reduction of grain structure.

     

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