Hardening mechanism of MP159 alloy
induced by aging
induced by aging
(1.Department of Materials Science and Engineering,
Nanchang Institute of Aeronautical Technology,
Nanchang 330034, China；
2.State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China)
Nanchang Institute of Aeronautical Technology,
Nanchang 330034, China；
2.State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China)
Abstract: The microstructural changes of both solution heat treated (ST) and cold worked (CW) MP159 alloy during aging were investigated by optical microscopy and transmission electron microscopy (TEM). The results indicate that both solution heat treated (ST) and cold worked (CW) MP159 alloy could be hardened by aging. This aging induced hardening is attributable to the precipitation of a very finely dispersed ordered cubic γ′ phase particles with only several nanometres in diameter. The hexagonal close packed (HCP) ε-martensite precipitated during aging of both CW MP159 and CW MP35N, and the hexagonal ordered Co3Mo phase of the DO19 structure type precipitated during aging of CW MP35N, have not bee n found in the present investigation.
Key words: aging; hardening mechanism; MP159 alloy; cubic γ′ phase