Effects of grain size on plastic deformation in a β CuAlBe shape memory alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:600

Article

Montecinos, S.^1,2  Cuniberti, A.^1,2 

[1] Univ Nacl, Inst Fis Mat Tandil IFIMAT, Fac Ciencias Exactas, Ctr Prov Buenos Aires, Buenos Aires, DF, Argentina

[2] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina

关键词: Mechanical characterization;    Strain measurement;    Shape memory alloys;    Martensitic transformations;    Plasticity;   

DOI  :  10.1016/j.msea.2014.02.028

来源: Elsevier

【 摘 要 】

The effects of grain size on the deformation under compression of a beta Cu-11.4A1-0.5Be (wt%) polycrystalline shape memory alloy were analyzed. As the maximum stress increases, major levels of pseudoelastic strain are obtained and the strain retained on unloading increases. The plot retained strain versus applied strain gives a unique curve that is independent of the grain size, with a pure pseudoelastic behavior up to around 3% of applied strain. The largest pseudoelastic strain possible to obtain increases as the grain size increases. Surpassed that strain, plastic deformation occurs and the macroscopic plastic stress follows a Hall-Petch type relation. In samples with plastic deformation the reverse martensitic transformation occurs in two stages, with a second high temperature calorimetric peak associated to the transformation of plastic deformed martensite. (c) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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