Materials Transactions Online

Materials Transactions, Vol.48 No.09 (2007) pp.2403-2408
© 2007 The Japan Institute of Metals

Mechanical Properties of Co-Based L12 Intermetallic Compound Co3(Al,W)

Seiji Miura, Kenji Ohkubo and Tetsuo Mohri

Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan

Mechanical properties of L12-Co3(Al,W) polycrystalline sample are investigated by compression testing at various temperature ranging from room temperature to 1193 K. It was found that at room temperature the 0.2% flow stress is 410 MPa and the compressive ductility is higher than 10%, whereas at 1193 K the 0.2% flow stress is 382 MPa and the compressive ductility is about 10%. Two candidates for the reaction scheme of the Co-rich region of the Co-Al-W ternary phase diagram are proposed by combining the results of microstructure observation, X-ray diffractometry and the previous report.

(Received 2007/4/24; Accepted 2007/7/3; Published 2007/8/22)

Keywords: cobalt alloys, intermetallic compounds, high temperature deformation, phase diagram

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