Influence of the Deep Cryogenic Treatment at the Stabilization of Martensitic Transformation Temperatures at the Smart Material Alloy Cu-14Al-4Ni

• 作者: Emmanuel Pacheco Rocha Lima Marcelo Nava Pedro Cunha de Lima
• 来源期刊: 材料科学与工程:中英文A版
• 学科: 工学
• 关键词: DCT SMA(shape memory alloy) Cu-Al-Ni alloy
• 年，卷（期）: clkxygczy-a,（2）
• 页码范围: 60-64
• 页数: 5页
• 分类号: TG1

摘要

DCT(deep cryogenic treatment)is commonly used in industry to improve the wear resistance characteristics of steels,especially.However,there are just a few researches about the effects on non-ferrous metals.The purpose of this work was to investigate how DCT affects the properties of Cu-14Al-4Ni alloy treated at different soak time and submitted to thermomechanical cycling.A comparative experimental analysis was performed of the thermal properties of alloys obtained on a vacuum furnace,treated by DCT and thermomechanically cyclized.The results indicates that thermomechanical cycling promoted the appearance and growth of the martensitic phaseγ'1,less ductile than the martensitic phaseβ'1,which together with the induced hardening produced an increase in transformation temperatures and microhardness.The higher the number of cycles,the greater these effects.The DCT promoted an increase in the intensity of the diffraction peaks corresponding to the phaseβ'1 and the maintenance of them during the thermomechanical cycling of the material,which indicates that the DCT stabilizes the martensitic phaseβ'1 and,consequently,caused a reduction and stabilization of the martensitic transformation temperatures and the microhardness,when compared to the untreated material.The longer the soaking time of DCT,the greater these effects.