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

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  • Goto Kenji
    Institute of Innovative Research, Tokyo Institute of Technology TANAKA KIKINZOKU KOGYO K.K.
  • Umise Akira
    Institute of Innovative Research, Tokyo Institute of Technology Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
  • Tahara Masaki
    Institute of Innovative Research, Tokyo Institute of Technology
  • Hosoda Hideki
    Institute of Innovative Research, Tokyo Institute of Technology

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  • Compressive Deformation Behavior and Magnetic Susceptibility of Au₂CuAl Biomedical Shape Memory Alloys

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Abstract

<p>The compressive deformation behavior and magnetic volume susceptibility were investigated for Au2CuAl biomedical shape memory alloys in a compositional range from 25 to 45 mol%Cu. Compression tests revealed that the stress for martensite variant reorientation was 282 MPa 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 ⟨111⟩-type. The measured magnetic volume susceptibility was −2.7 × 10−6 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 × 10−6 with increasing Cu content.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 60 (5), 662-665, 2019-05-01

    The Japan Institute of Metals and Materials

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