合金粉を用いた高強度P/Mアルミニウム合金圧延板の機械的性質に及ぼす製造時における脱ガス条件の影響

概要

論文の詳細を見る
The rolled sheets were made by P/M method from 7091 alloy powder, and effects of degassing conditions on mechanical properties and microstructures were studied. The green compacts of the powder were encapsulated, and degassed at 653 K-773 K for 0.3 h-24 h in about 10-3 Pa vacuum. Following degassing, the compacts were hot pressed, hot rolled with 88% reduction, and then cold rolled with 67% reduction to obtain 1 mm thick sheets. Results obtained were as follows: 1) The degassing conditions considerably influenced the ultimate tensile strength (UTS) and the yield strength (YS) of the P/M sheets in T6 temper. The P/M sheets made through degassing at 733773 K for I h or more showed the highest UTS of about 630 PMa. 2) The recrystallized grain size of the P/M sheets in T6 temper was also influenced by the degassing conditions, and the relatively high degassing temperatures of 733-773 K led to fine grain size. 3) The P/M 7091 alloy sheets made through degassing at 733 k for 1 h showed higher UTS than those of I/M 7091 and I/M 7075 alloy sheets in T6 temper, and the differences were 35 MPa or more.
社団法人粉体粉末冶金協会の論文