Journal
ACTA MATERIALIA
Volume 52, Issue 15, Pages 4479-4492Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2004.06.007
Keywords
shape memory alloys; X-ray diffraction; crystal structure; lattice parameters
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An X-ray diffractometry study of Ti-47.0 to 50.7 at.%Ni alloys was performed. In the 50.0-50.7 at.% range of nickel content, a concentration dependence of B19'-martensite lattice parameters (MLP) is observed. MLP are found to be identical for 47.0 and 50.0 at.% of nickel content. The temperature dependence of MLP is observed, and this dependence is enhanced in the reverse transformation temperature range for Ti-50.0 at.%Ni alloy. MLP are different for the quenched martensite and for the martensite formed from the austenite containing a well-developed dislocation substructure. It is proven that the presence of an intermediate R-phase during martensitic transformation is not responsible for the changes in MLP, observed in hyper-equiatomic alloys or in alloys having a highly dislocated austenite substructure. In the 50.0 at.%Ni alloy, no changes in MLP are observed after a 25% cold-deformation of the already formed thermal martensite. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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