Stability of hume rothery phases in Cu−Zn alloys at pressures up to 50 GPa
- Edinburgh
The crystal structure of the {gamma}-brass phase Cu{sub 5}Zn{sub 8} is confirmed with single-crystal X-ray diffraction and a charge-coupled device (CCD) detector to be cubic with 52 atoms in the unit cell, space group I{bar 4}3m, and the refined atomic positions are in good agreement with previously reported data. The structural behavior of {alpha}-(fcc), {beta}-brass (cI52) phases of the Cu-Zn alloy system has been studied under pressure using diamond anvil cells and powder X-ray diffraction with synchrotron radiation. The appearance of additional peaks in the diffraction patterns of {alpha}- and {beta}-phases indicates the beginning of transitions to new phases at 17 and 37 GPa, respectively. The complex cubic {gamma}-brass phase (52 atoms in the unit cell, space group I{bar 4}3m) is observed to be stable up to at least 50 GPa. The bulk modulus K 0 was determined as 140(4) GPa for {alpha}-, 139(5) for {beta}-, and 121(2) for {gamma}-phase assuming K 0 = 4. The structural stability of brass phases of the Cu-Zn system under pressure is discussed in terms of the Hume-Rothery mechanism.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1007772
- Journal Information:
- Metall. Mater. Trans. A, Vol. 37, Issue (12) ; 03, 2006
- Country of Publication:
- United States
- Language:
- ENGLISH
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