Precursor phenomenon of martensitic transformation in Au-49.5at%Cd alloy

Technical Report · Sat Dec 31 04:00:00 EST 1994

DOI:https://doi.org/10.2172/10121178· OSTI ID:10121178

Ohba, Takuya ^[1]; Shapiro, S M ^[2]; Aoki, Shingo; Otsuka, Kazuhiro ^[3]

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1. Teikyo Univ., Utsunomiya (Japan). Dept. of Materials Science and Engineering
2. Brookhaven National Lab., Upton, NY (United States)
3. Univ. of Tsukuba, Ibaraki (Japan). Inst. of Materials Science

Phonon softening was observed in the parent phase of a AuCd alloy which t=forms from the {beta}{sub 2}(B2) parent to {zeta}{sub 2}{prime} (trigonal) martensitic. Since Cd strongly absorbs neutrons, the isotope {sup 114}Cd was used in preparing the single crystal for the measurements. The [{zeta}{zeta}0]TA{sub 2} phonon branch was measured and found to be anomalously low. A minimum is present at {zeta} = 0.35 which softens with decreasing temperature towards Ms. The results are consistent with the model proposed by Ohba et al. based upon a crystallographic study of the {zeta}{sub 2}{prime} phase.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 10121178
• Report Number(s): BNL--61391; CONF-941144--66; ON: DE95007698
• Country of Publication: United States
• Language: English

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CRYSTAL-PHASE TRANSFORMATIONS
DIAGNOSTIC TECHNIQUES
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