Rare earth Ni-Mg-Co-Ga-based high-temperature shape memory alloy

Abstract

The invention discloses a rare earth Ni-Mg-Co-Ga-based high-temperature shape memory alloy relating to a shape memory alloy. The invention provides a rare earth Ni-Mg-Co-Ga-based high-temperature shape memory alloy with high martensite phase-transition temperature and better plasticity and shape memory function, and a preparation method thereof. The chemical formula is (Ni53Mn22Co6Ga19)100-xAx, wherein A=Dy, Y and Gd, and the atom percent of x is 0-1. Ni, Mg, Co, Ga and rare earth raw material are put into a furnace, vacuumized, charged with argon and smelted to obtain the ingot material of the rare earth Ni-Mg-Co-Ga-based high-temperature shape memory alloy; the ingot material of the rare earth Ni-Mg-Co-Ga-based high-temperature shape memory alloy is processed by heating and is cooled along with the furnace; the ingot material of the rare earth Ni-Mg-Co-Ga-based high-temperature shape memory alloy, on which heat treatment is performed, is rolled into lamellar alloy; the obtained lamellar alloy is cut into test specimen; and after processed by heating, the test specimen is quenched by ice water to obtain the rare earth Ni-Mg-Co-Ga-based high-temperature shape memory alloy.

Description

technical field

[0001] The invention relates to a shape-memory alloy, in particular to a rare-earth nickel-manganese-cobalt-gallium-based high-temperature shape-memory alloy. Background technique

[0002] At present, the high-temperature shape memory alloys with a martensite transformation temperature exceeding 200 °C mainly include (Ni-X)Ti system (X=Pt, Pb, Au), Ni(Ti-X) system alloy (X=Hf , Zr), NiAl alloys and CuAl alloys etc. Research progress of shape memory alloys, Materials Science and Engineering, 1994, 12(1), 5; 3, K.Otsuka and X.Ren, Rencent development in the research of shape memory alloys, Intermetallics7, 511-528(1999); 4. J.Van Humbeeck, High temperature shape memory alloys, J.Eng.Mater.Tech, 1999, 121, 98), but these alloy systems all have problems of one kind or another, for example, NiAl system and CuAl system high temperature shape memory The alloy is not stable enough, and its memory effect will deteriorate sharply with the precipitation of equilibrium...

Images