Effect of Aging on the Structure and Transformation Behavior of Cu-12Al-3.5Ni-0.7Ti-0.05RE High Temperature Shape Memory Alloy

被引：9

作者：

Dalvand, Pegah ^{[1
]}

Raygan, Shahram ^{[1
]}

Lopez, Gabriel A. ^{[2
]}

Melendez, Mariano B. ^{[3
]}

Chernenko, Volodymyr A. ^{[4
,5
,6
,7
]}

机构：

[1] Univ Tehran, Coll Engn, Sch Met & Mat Engn, POB 11155-4563, Tehran, Iran

[2] Univ Basque Country, Dept Appl Phys 2, UPV EHU, POB 644, Bilbao 48080, Spain

[3] Univ Basque Country, Gen Res Serv SGIker, UPV EHU, Leioa 48940, Spain

[4] Univ Basque Country, UPV EHU, UPV EHU Sci Pk, Leioa 48940, Spain

[5] Basque Ctr Mat Applicat & Nanostruct, BCMat, UPV EHU Sci Pk, Leioa 48940, Spain

[6] Tokyo Inst Technol, Inst Innovat Res IIR, Yokohama, Kanagawa 2268503, Japan

[7] Basque Fdn Sci, Ikerbasque, Bilbao 48013, Spain

来源：

METALS AND MATERIALS INTERNATIONAL | 2020年 / 26卷 / 09期

关键词：

Cu-Al-Ni-Ti-RE high temperature shape memory alloy; Aging; Rare earth elements; Martensitic transformation; Precipitates; MECHANICAL-PROPERTIES; MARTENSITIC-TRANSFORMATION; GRAIN-REFINEMENT; DECOMPOSITION PROCESS; PHASE-TRANSFORMATION; THERMODYNAMIC ANALYSIS; BETA-PHASE; AL; MICROSTRUCTURE; TI;

D O I：

10.1007/s12540-019-00376-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, the effect of isothermal aging on the thermoelastic martensitic transformation and microstructure of the as-quenched Cu-12Al-3.5Ni-0.7Ti-0.05RE (RE=Ce, La) high temperature shape memory alloy was studied. The results showed that the alloy microstructure and martensitic transformation are strongly influenced by the aging temperature rather than aging time. During aging at 350 degrees C the alloy was prone to both the precipitation of the gamma (2) phase and the bainitic transformation, resulting in a loss of martensitic transformation and damping capacity. The prolonged aging at 350 degrees C caused a decomposition of parent phase into the equilibrium gamma (2) phase alongside the alpha phase which produced a significant hardness increment. On the other hand, aging at 250 degrees C affected the microstructure only slightly producing insignificant shift in the transformation temperatures. It was found that, the secondary phases including Ti-rich X-phase and the RE-rich phase were not influenced by the aging process. The results prescribe a high temperature order of the stability of martensitic transformation for this new alloy which is important for its high temperature shape memory applications.Graphical Abstract

引用

页码：1354 / 1365

页数：12

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