Phase transformations during continuous cooling of polycrystalline β-CuAlBe alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:467

Article

Montecinos, S.^1,2  Cuniberti, A.^1,2  Castro, M. L.^1,2  Boeri, R.^2,3 

[1] Univ Nacl Ctr Prov Buenos Aires, Inst Fis Mat Tandil, RA-7000 Tandil, Argentina

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

[3] Univ Nacl Mar Plata, Fac Ingn, INTEMA, Mar Del Plata, Buenos Aires, Argentina

关键词: Metals and alloys;    Precipitation;    Phase transitions;    Shape memory;    Metallography;   

DOI  :  10.1016/j.jallcom.2007.12.062

来源: Elsevier

【 摘 要 】

The transformations during continuous cooling and their effect on the thermoelastic behaviour of beta-CuAlBe shape memory alloys have been studied by electrical resistometry, microscopy and differential calorimetry. Under slow cooling rates, the alloys show hypereutectoid behaviour as a result of the addition of Be. The sequence of gamma(2) and alpha' precipitation and the ordering of beta phase were clearly identified. A quasi-binary phase diagram with variable Be content is proposed. Small modifications in the Be content cause noticeable changes in the ranges of phase stability. The precipitation could be avoided with high cooling rates. The precipitation processes produce changes in the matrix composition, which affect the critical temperatures of ordering as well as the beta-martensite transformation. (C) 2007 Elsevier B.V. All rights reserved.

【 授权许可】

Free