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The compressive deformation behavior and magnetic volume susceptibility were investigated for Au2CuAl biomedical shape memory alloys in a compositional range from 25 to 45mol%Cu. Compression tests revealed that the stress for martensite variant reorientation was 282MPa in Au2CuAl, and the value increased with the Cu content. On the other hand, the slip stress was higher at intermediate compositions. Moreover, intergranular fracture was suppressed during compressive deformation. Calculated antiphase boundary (APB) energies suggest the dissociation of superlattice dislocation, which leads to the active slip of ©111a-type. The measured magnetic volume susceptibility was 12.7 © 1016 in Au2CuAl, hence, this alloy is judged to be metal-artifact-free in magnetic resonance imaging (MRI). The magnetic susceptibility increased up to +7.0 © 1016 with increasing Cu content. [doi:10.2320/matertrans.MB201810]

Compressive Deformation Behavior and Magnetic Susceptibility of Au<sub>2</sub>CuAl Biomedical Shape Memory Alloys