[110]TA1 phonon dispersion relation of the β1-phases in Ni–Co–Al alloys

✍ Scribed by M Yamada; A Nagasawa; Y Ueno; Y Morii

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 91 KB
• Volume: 60
• Category: Article
• ISSN: 0022-3697
• DOI: 10.1016/s0022-3697(99)00138-9

✦ Synopsis

The present study is mainly concerned with the relation between electron concentration and anomalous dip appearing on the [110]TA 1 phonon branch of the b 1 -phase (B2-structure) in Ni-Al alloys. By substituting Co for Ni, the dip-position shifts toward the Brillouin zone center. In addition, we prove that the dip appears also in the equilibrium b 1 -phase existing above T btemperature, below which Ni 3 Al precipitates. The obtained results indicate clearly that the dip is not any precursor of the martensitic transition but a reflection of the electronic property in the b 1 -phase.