RECOVERY OF COLD DEFORMED HIGH PURE SILVER

ＲＥＣＯＶＥＲＹＯＦＣＯＬＤＤＥＦＯＲＭＥＤＨＩＧＨＰＵＲＥＳＩＬＶＥＲＮｉｎｇＹｕａｎｔａｏ；ＷｅｎＦｅｉ；ＺｈａｏＨｕａｉｚｈｉ；ＤｅｎｇＤｅｇｕｏ（ＩｎｓｔｉｔｕｔｅｏｆＰｒｅｃｉｏｕｓＭｅｔａｌｓ，Ｋｕｎｍｉｎｇ６５０２２１）Ａｂｓｔｒａｃｔ...

The changes of mechanical and electrical properties as well as lattice distortion of cold deformed silver with high purity of 99.999% were studied in its recovery processes at 23 and 50 degrees C temperatures. The high pure silver showed a low recrystallization temperature of 70 degrees C and obvious natural recovery softening effect. The recovery process was quickened with increasing cold deformation degree and rising age temperature, obeying an isothermal recovery rate equation: ln(x(0)/x) = Kt. The recovery activation energy of the high pure silver was found to be E = 20 kJ/mol, and the recovery process was mainly controlled by point defect recovering mechanism.