Occurrence of HDDR phenomena and grain refinements for Al-Mg alloys

Takao Funayama, Junya Takahashi, Atsunori Kamegawa, Hitoshi Takamura, Masuo Okada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Present paper describes the effects of the Mg content on the occurrence of HDDR phenomena as well as the microstructural evolution in Al-(3-7.8mass%)Mg alloys. It was found that the HDDR phenomena take place in all those alloys, and grain size of the alloy turned into a several 10 run after HDDR treatments such as heat-treatment at 350°C under hydrogen pressure of 7.5 MPa for 72 h, in following by the hydrogen desorption treatment at 350°C for 4 h in vacuum. The refined grain size of Al-3.0mass% Mg alloy was observed to be largest among there alloys. However, it should be emphasized that small content of Mg (3 mass%) is able to induce the HDDR phenomena associated with the nano-order grain refinements in Al-Mg alloys. This could be the first observation of HDDR phenomena which occur in Al-3 and 5mass%Mg alloys, and are effective for yielding the nano-order fine grain size.

Original languageEnglish
Pages (from-to)874-878
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number12
Publication statusPublished - 2005 Dec


  • Al-Mg alloy
  • Grain size refinement
  • HDDR
  • Hydrogen-treatment
  • Hydrogenation disproportionation desorption recombination phenomena


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