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Solid solubility metastable extension of some transition metals in gold

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Abstract

The metastable extended solid solubilities of the transition metals Ti, Zr, Hf, W, Re, Ru and Rh in gold have been studied by measuring the lattice parameters of their gold-rich solid solutions using X-ray diffraction. The cooling rate used for the preparation of the alloys was about 106 K/s. It was found that the metastable solid solubilities of Ti, Zr and Hf in gold were 18. 2, 13. 0, and 13. 4 at% respectively, but that those of W, Re, Ru, and Rh in gold were negligible. It is concluded that metastable extension of the solid solubilities of transition metals in gold is relative to the nature of the phase diagrams of their alloys with gold. Under conditions of rapid solidification, the alloys with upper-peritectic-type phase diagrams had significant solid solubility extensions and the alloys with monotectic-type phase diagrams displayed little solid solubility extension. Mechanical alloying may be more effective in producing metastable solid solutions of these alloys.

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Additional information

Professor Zhou Xinming is currently a Research Fellow in the Institute of Precious Metals, Kunming, Yunnan, China. He has made many original contributions in the field of precious metals alloy materials, including high purity gold alloys for the electronics industry. He has also carried out substantial research on metastable alloys.

Li Qubo is a Senior Engineer and a member of Professor Zhou's research group. His recent research has been concerned with gold and gold alloys, including their use in the microelectronics industry.

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Qubo, L., Xinming, Z. Solid solubility metastable extension of some transition metals in gold. Gold Bull 31, 30–32 (1998). https://doi.org/10.1007/BF03215474

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Keywords

  • Phase Diagram
  • Mechanical Alloy
  • Solid Solubility
  • Rapid Solidification
  • Gold Bulletin