CN104233132A

CN104233132A - Heat treatment technology for improving room-temperature mechanical properties of copper-zinc-aluminium shape memory alloy

Info

Publication number: CN104233132A
Application number: CN201310233899.7A
Authority: CN
Inventors: 司松海; 李晓薇; 王文华; 刘光磊; 杨嵩
Original assignee: Zhenjiang Yinuowei Shape Memory Alloys Co Ltd
Current assignee: Zhenjiang Yinuowei Shape Memory Alloys Co Ltd
Priority date: 2013-06-13
Filing date: 2013-06-13
Publication date: 2014-12-24

Abstract

A heat treatment technology for improving room-temperature mechanical properties of copper-zinc-aluminium shape memory alloy is disclosed and belongs to the field of memory alloy. The technology is characterized by comprising firstly performing annealing processing on alloy obtained by using a casting method, keeping warm at 820 DEG C for 24 h, cooling along with the furnace temperature, then cutting and removing a zinc-removal layer with the thickness of 2-3 mm and casting defecting on the surface, then forging and rolling the ingot casting to prepare a plate with the thickness of 11 mm, and then employing a heat treatment technology of water quenching combined with two-stage aging treatment and oil quenching combined with two-stage aging treatment to process the plate.

Description

A kind of thermal treatment process improving copper-zinc-aluminum shape memory alloy room-temperature mechanical property

Technical field

The invention belongs to field of memory alloy, refer in particular to a kind of thermal treatment process improving copper-zinc-aluminum shape memory alloy room-temperature mechanical property.

Background technology

Copper-based shape memory alloy is one of the new function material of two active research and exploitations during the last ten years both at home and abroad in the past, finds that there is good shape memory effect at the tens of kinds of copper base alloys such as Cu-Zn, Cu-Zn-Al, Cu-Sn, Cu-Al-Ni, Cu-Al-Be, Cu-Sn-Si, Cu-Zn-Ga at present.Wherein most widely used is Cu-Zn-Al and Cu-Al-Ni system alloy.Although copper-based shape memory alloy has good shape memory effect and cheap price, prospect is very tempting, but due to the various defects of material itself, copper-based shape memory alloy also exists some problems in memory performance, mechanical property, limit its application and development in Practical Project.In order to improve ductility, suppress intercrystalline failure, improve fatigue lifetime and friction and wear behavior thereof, current main method has: 1. change alloy formula, 2. carries out refinement and Metamorphism treatment, 3. heat-treats.Wherein, first method realizes more complicated; It is obvious not that second method improves effect.Therefore, heat-treat nature and become the most effective means.

The present invention proposes a kind of thermal treatment process improving copper-zinc-aluminum shape memory alloy room-temperature mechanical property.

Summary of the invention

The present invention proposes a kind of thermal treatment process improving copper-zinc-aluminum shape memory alloy room-temperature mechanical property, it is characterized by: to the alloy obtained by castmethod, first carry out anneal, furnace cooling after being incubated 24 hours at 820 DEG C, then the dezincify layer and casting flaw of removing surface 2 ~ 3mm is cut, again ingot casting forged, be rolled into the thick sheet material of 11mm, then take two kinds of heat treatment modes respectively:

1, shrend adds two-stage ageing treatment, and namely 800-820 DEG C of insulation is quenched in room temperature water in 1 hour, takes out air cooling to room temperature after being then incubated 0.5 hour in preprepared 100 DEG C of boiling water, and then takes out air cooling to room temperature be incubated 0.5 hour in 50 DEG C of water after;

2, oil quenching adds two-stage ageing treatment, and namely 800-820 DEG C of insulation is quenched in room temperature machine oil for 1 hour, takes out air cooling to room temperature after being then incubated 0.5 hour in preprepared 100 DEG C of boiling water, and then takes out air cooling to room temperature be incubated 0.5 hour in 50 DEG C of water after;

The copper-zinc-aluminum shape memory alloy of room-temperature mechanical property excellence can be obtained by above method.

Embodiment

embodiment 1

Select that weight percent is Zn25.25 wt %, Al3.75 wt % respectively, Ni0.9 wt %, compound rare-earth 0.7 wt %(wherein: Nd 10 ~ 15wt%, La 10 ~ 15 wt%, Y 8 ~ 12wt%, Ce 8 ~ 12wt%, Tb 5 ~ 8 wt%, Gd 5 ~ 8 wt%, Pr+Sc+Eu+Ho+Er+Tm+Lu be 10 ~ 20wt%, Zr 3 ~ 6wt%, Ti 2 ~ 5wt%, B 2 ~ 5wt%, Yu Weitong.), surplus be the alloy of copper is test materials.Room-temperature mechanical property test is carried out respectively on WE-10 type fluid pressure type tensile testing machine and HB-3000 type Brinell testing machine.This strength of alloy 520.5MPa is recorded, elongation 7.5%, Brinell hardness 165HB without any thermal treatment.

embodiment 2

Select that weight percent is Zn25.25 wt %, Al3.75 wt % respectively, Ni0.9 wt %, compound rare-earth 0.7 wt %(wherein: Nd 10 ~ 15wt%, La 10 ~ 15 wt%, Y 8 ~ 12wt%, Ce 8 ~ 12wt%, Tb 5 ~ 8 wt%, Gd 5 ~ 8 wt%, Pr+Sc+Eu+Ho+Er+Tm+Lu be 10 ~ 20wt%, Zr 3 ~ 6wt%, Ti 2 ~ 5wt%, B 2 ~ 5wt%, Yu Weitong.), surplus be the alloy of copper is test materials.Room-temperature mechanical property test is carried out respectively on WE-10 type fluid pressure type tensile testing machine and HB-3000 type Brinell testing machine.Two-stage aging strengthening model is added through shrend, namely 800-820 DEG C of insulation is quenched in room temperature water in 1 hour, then air cooling is taken out to room temperature after being incubated 0.5 hour in preprepared 100 DEG C of boiling water, and then take out air cooling to room temperature be incubated 0.5 hour in 50 DEG C of water after, record this memorial alloy tensile strength 686.5MPa, elongation 8.9%, Brinell hardness 198HB.

embodiment 3

Select that weight percent is Zn25.25 wt %, Al3.75 wt % respectively, Ni0.9 wt %, compound rare-earth 0.7 wt %(wherein: Nd 10 ~ 15wt%, La 10 ~ 15 wt%, Y 8 ~ 12wt%, Ce 8 ~ 12wt%, Tb 5 ~ 8 wt%, Gd 5 ~ 8 wt%, Pr+Sc+Eu+Ho+Er+Tm+Lu be 10 ~ 20wt%, Zr 3 ~ 6wt%, Ti 2 ~ 5wt%, B 2 ~ 5wt%, Yu Weitong.), surplus be the alloy of copper is test materials.Room-temperature mechanical property test is carried out respectively on WE-10 type fluid pressure type tensile testing machine and HB-3000 type Brinell testing machine.Two-stage aging strengthening model is added through shrend, namely 800-820 DEG C of insulation is quenched in room temperature water in 1 hour, then air cooling is taken out to room temperature after being incubated 0.5 hour in preprepared 100 DEG C of boiling water, and then take out air cooling to room temperature be incubated 0.5 hour in 50 DEG C of water after, record this memorial alloy tensile strength 695.5MPa, elongation 9.5%, Brinell hardness 186HB.

Claims

1. one kind is improved the thermal treatment process of copper-zinc-aluminum shape memory alloy room-temperature mechanical property, it is characterized by: to the alloy obtained by castmethod, first carry out anneal, furnace cooling after being incubated 24 hours at 820 DEG C, then the dezincify layer and casting flaw of removing surface 2 ~ 3mm is cut, again ingot casting is forged, be rolled into the sheet material that 11mm is thick, then two kinds of heat treatment modes are taked respectively: shrend adds two-stage ageing treatment, namely 800-820 DEG C of insulation is quenched in room temperature water in 1 hour, then air cooling is taken out to room temperature after being incubated 0.5 hour in preprepared 100 DEG C of boiling water, and then take out air cooling to room temperature be incubated 0.5 hour in 50 DEG C of water after, oil quenching adds two-stage ageing treatment, and namely 800-820 DEG C of insulation is quenched in room temperature machine oil for 1 hour, takes out air cooling to room temperature after being then incubated 0.5 hour in preprepared 100 DEG C of boiling water, and then takes out air cooling to room temperature be incubated 0.5 hour in 50 DEG C of water after.

2. a kind of thermal treatment process improving copper-zinc-aluminum shape memory alloy room-temperature mechanical property according to claim 1, thermal treatment process preferably can add two-stage ageing treatment by oil quenching, this memorial alloy tensile strength 695.5MPa after thermal treatment, elongation 9.5%, Brinell hardness 186HB.