Electron Microscopy Study of Stress-induced Acicular γ′ Martensite in Cu–Al–Ni Alloy

• Otsuka Kazuhiro

  Institute of Scientific and Industrial Research, Osaka University

• Nakamura Takemi

  Graduate School, Osaka University

• Shimizu Ken’ichi

  Institute of Scientific and Industrial Research, Osaka University

Bibliographic Information

Other Title

• Electron Microscopy Study of Stress-induced Acicular γ′ Martensite in Cu–Al–Ni Alloy

Abstract

Stress-induced acicular martensites in Cu-14.2Al-4.3Ni (wt%) alloy were investigated by means of transmission electron microscopy and selected area electron diffraction method. As a result acicular γ′ martensites were found beside numerous β₁′ martensites reported previously, although the occurrence was quite rare. This martensite is different from the spear-like martensite thermally formed in the same alloy in several respects such as in shape, lattice invariant shear, habit plane and orientation relationship, even though both have the same crystal structure and lattice parameters. The lattice invariant strain of the martensite was found to be stacking faults on the basal plane, and a defectless region was observed at the middle of the martensite, which is in sharp contrast to the midribs in ferrous twinned martensites. The habit plane was roughly located between (32\bar1)_β<SUB>1</SUB> and (32\bar2)_β<SUB>1</SUB>. The orientation relationship was found to be (110)[1\bar11]_β<SUB>1</SUB>⁄⁄(121)[0\bar12]_γ′.

Journal

• Transactions of the Japan Institute of Metals

  Transactions of the Japan Institute of Metals 15 (3), 211-216, 1974

  The Japan Institute of Metals

Keywords

• General Engineering

Details

• CRID: 1390001205119161984
• NII Article ID: 130003485293
• DOI: 10.2320/matertrans1960.15.211
• COI: 1:CAS:528:DyaE2cXlsFOju7g%3D
• ISSN: 24324701
• ISSN: 00214434
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1960/15/3/15_3_211/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed