Open AccessINVESTIGATION ON INTERMARTENSITIC TRANSFORMATION IN Ni-Mn-Ga ALLOY
Author(s) -
敖玲,
王文洪,
陈京兰,
高淑侠,
吴光恒
Publication year - 2001
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.50.793
Subject(s) - materials science , grinding , diffusionless transformation , crystallite , martensite , lattice (music) , transformation (genetics) , alloy , single crystal , condensed matter physics , crystallography , metallurgy , microstructure , chemistry , physics , biochemistry , acoustics , gene
A complete thermally induced intermartensitic transformation has already been observed in a single crystalline Ni52Mn24Ga24 sample with martensitic transformation temperature (Ms) near room temperature.As constrast with the single crystalline sample,polycrystalline samples,even those annealed ones,did not show this intermartensitic transformation.The experimental results indicates that the intermartensitic transformation can be suppressed by mechanically grinding the single crystalline sample to smaller sizes.This has been attributed to the internal stress and serious lattice distortion caused by the grinding process.The intermartensitic transformation might be suppressed by the elastic energy stored in distorted lattice.As the evidence,grinding the sample to 50μm,the martensitic transformation was even disappeared in the present measurements.Based on this point,the uncompleted intermartensitic transformation observed in the previous works can be explained.