合金粉および混合粉の焼結体を圧延した高強度Ｐ／Ｍアルミニウム合金板の諸性質

Abstract

P/M 7091 alloy sheets were rolled directly from sintered compacts, and the properties of the sheets were investigated. The alloy powder, and the mixed powders M1 and M2 having same composition of 7091 alloy were used for starting powders. M1 was the mixture of AI-Zn-Co mother alloy, Al-Mg mother alloy, Al-Cu mother alloy and Al elemental powders. M2 was the mixture of Al-Co mother alloy, Zn, Mg and Cu elemental powders. The green compacts of the alloy powder and the M1, M2 powders were sintered 803-863 K for 1 h in N2. The sintered compacts were hot rolled and cold rolled, then were heat treated to T6 condition. Results obtained were as follows:1) While the cracking of P/M sheets often occurred during hot rolling process when they were made from 7091 alloy powder and mixed powder M1. The cracking of the sheet from mixed powder M2 was not observed.2) The highest UTS and elongation values of the P/M sheets rolled from sintered compacts in this study were about 590MPa and 11%, but these values were lower than those of the P/M sheets rolled from degassed and hot pressed compacts of 7091 alloy powder.3) Hydrogen contents of the P/M sheets rolled from sintered compacts decreased with increasing the sintering temperature. And it was less than 2 p.p.m., for the sheets rolled from compacts sintered at 863 K.