EFFECT OF FABRICATION CONDITIONS AND Cr, Zr CONTENTS ON THE GRAINSTRUCTURE OF 7075 AND 6061 ALUMINUM ALLOYS
The correlation between compression conditions at temperatures in the range of 573-773K with the strain rate range of 0.002-2s and grain size after solution heat treatment of 7075 alloy was investigated, as contrasted with 6061 alloy. The grain coarsening occurred under specific Zener-Hollomon parameters of Sx1010-1012s-1 for 7075 alloy, 108-2x1012s-1 for 6061 alloy, respectively.These phenomena could be explained by crystalline orientation analysis and stored deformation strain evaluation. Subgrains with less than 1_5 degree boundary and stored strain after compression increased,but recryastallized grains after solution heat treatment increased with Z parameter. Small Z parameter condition could get low stored strain with fine grain which is stable during SHT. Effect of Cr and Zr on the grain structure of 7075 alloy was also investigated. Cr or Zr addition could inhibits the grain coarsening. The role of Zr addition was confirmed to pinning effect of A13Zr dispersoids to subgrain boundaries.
7075 alloy Cr Zr High temperature compression Zener-Hollomon parameter Grain size
Pizhi ZHAO Takavuki TSUCHIDA
Research and Development Center, Nippon Light Metal Company, LTD.1-34-1 Kambara, Shimizu-Ku, Shizuoka-City, Shizuoka-Ken, 421-3203, Japan
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）