Effect of Tensile and Compressive Stress on Martensitic Transformation and Deformation Behavior of Cu-Al-Ni Alloys (Supplement)

概要

論文の詳細を見る
A supplemental study has been carried out on the effect of tensile and compressive stress on martensitic transformation and deformation behavior of Cu-Al-Ni alloys. The stress-strain behavior obtained in tension and compression tests with separate specimens were fundamentally similar to those in the previous tension-compression tests with single specimens. However, in compression tests for β_1 single crystals, it was newly found that a temperature dependence of the β_1→β_1' or β_1→γ_1' transformation stress depended on the orientation of specimens. In compression tests for single variant γ_1' martensites below M_f, the deformation mode was found to be {121}_<γ_1'> twinning with the maximum Schmid factor but not {101}_<γ_1'> twinning. Tension-compression tests with an extensometer were fundamentally similar to the previous ones without an extensometer as to the temperature dependence of stress-strain behavior. Larger temperature dependence of critical stress and its resolved shear stress for the β_1→β_1' and β_1→γ_1' transformations on compression side than those on tension side was attributed to a different transformation strain due to the formation of different variants of martensites on tension and compression sides.
東北大学の論文