Grain size refinements of Au-Mg alloy by hydrogen absorption/desorption treatments

Yugo Takeda, Takahiro Kuriiwa, Atsunori Kamegawa, Masuo Okada

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


In the present paper, the possibility of occurrence of HDDR (hydrogenation disproportionation desorption recombination) phenomena were studied in an Au-2 mass%Mg alloy. Cathodic hydrogen-charging at R.T. in the alloy resulted in causing disproportionation reaction which formed MgH2 embedded in an Au matrix. After the heat-treatment in vacuum for 4 h at 500°C, MgH 2 decomposed into Mg and hydrogen. Mg resolved into Au matrix phase again. The original Au-Mg solid-solution alloys with size of 20-100 nm fine grains were obtained. This is the first observation of occurrence of HDDR phenomena in the Au-Mg alloys. The HDDR treated sample shows the slightly higher hardness in comparing with those of as-quenched samples.

Original languageEnglish
Pages (from-to)494-498
Number of pages5
JournalMaterials Transactions
Issue number3
Publication statusPublished - 2009 Mar


  • Cathodic hydrogen-charging
  • Gold alloy
  • Grain size refinement
  • Hydrogenation
  • Hydrogenation disproportionation desorption recombination (HDDR)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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