LATTICE-DYNAMICAL STUDY OF THE PREMARTENSITIC STATE OF THE CU-AL-BE ALLOYS

Article

关键词: SHAPE-MEMORY ALLOYS;    ZN-AL;    MARTENSITIC-TRANSFORMATION;    PHASE;    RELAXATION;   

DOI  :  10.1103/PhysRevB.48.15708

来源: SCIE

【 摘 要 】

Neutron-scattering techniques have been used to study the premartensitic state of a family of Cu-Al-Be alloys, which transform from the bec phase to an 18R martensitic structure. We find that the phonon modes of the TA2[110] branch have very low energies with anomalous temperature dependence. A slight anomaly at q = 2/3 was observed; this anomaly, however, does not change significantly with temperature. No elastic peaks, related to the martensite structure, were found in the premartensitic state of these alloys. The results are compared with measurements, performed under the same instrumental conditions, on two Cu-Al-Ni and a Cu-Zn-Al martensitic alloy.

【 授权许可】

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