Shape memory alloy

Abstract

The invention discloses a shape memory alloy, which is characterized by consisting of the following components in percentage by weight: 2.5 to 3.5 percent of Ni, 5 to 6 percent of Al, 6 to 8 percent of Mn, 0.8 to 1.0 percent of Be, 2 to 3 percent of Zn, 1.0 to 1.4 percent of Sb, 0.05 to 0.1 percent of La, 0.12 to 0.14 percent of Gd, 0.02 to 0.03 percent of Dy, 0.002 to 0.004 percent of Y and the balance of Cu.

Description

technical field [0001] The invention relates to the technical field of copper alloys, in particular to a shape memory copper alloy. Background technique [0002] There are three types of memory alloys: nickel-titanium alloys, copper-based alloys and iron alloys. Nickel-titanium alloys have higher memory performance, reaching 4 to 8%. However, nickel and titanium are strategic materials, the current price is high, and the production process is complicated, and the cost is high; copper-based alloys include: copper-zinc-aluminum, copper-aluminum-nickel, copper-aluminum-beryllium, copper-aluminum-manganese. The main disadvantage of copper-zinc-aluminum alloys is that the phenomenon of memory decay is serious; other copper-based alloys produced by smelting and rolling form coarse grains and polycrystals, and the direction of performance varies greatly, resulting in grain boundary fractures with weak strength perpendicular to the stress direction , the mechanism of low plasticit...

AI Technical Summary

Problems solved by technology

[0006] In the memory alloy of the above-mentioned patent, either a large amount of zinc is used to make it difficult to increase the phase transition temperature of martensite; or the amount of gallium added is very high, resulting in increased production costs