Age-Hardening Behavior of Mg-Al-Zn Alloys Produced by Sand Mold Casting

Seiji Saikawa; Yuhei Ebata; Kiyoshi Terayama; Susumu Ikeno; Emi Yanagihara

doi:10.4028/www.scientific.net/MSF.783-786.467

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Age-Hardening Behavior of Mg-Al-Zn Alloys Produced...

Age-Hardening Behavior of Mg-Al-Zn Alloys Produced by Sand Mold Casting

Abstract:

In recent years, Mg-Al-Zn system alloy has been used for the parts in the automobile for weight reductions. The age-hardening behavior of Mg-6mass%Al (-1mass%Zn)-0.3mass%Mn alloys sand mold castings were investigated by Vickers hardness measurement and optical microscopic observation. Both alloys were solution-treated and then isothermal-aged at 473, 498 and 523K. For each aging temperature, both alloys were indicated age-hardening obviously, and decreased the value of maximum hardness and shorten time to maximum hardness with heighten aging temperature. Age-hardening curves for both alloys approximately showed the same change of hardness. However, these optical micrographs after aging treatment are observed different microstructure. In case of AM60 magnesium alloy, discontinuous precipitation preferentially occurred in aged sample. The volume fraction of discontinuous precipitation was larger than that of continuous precipitation. On the other hand, in case of AZ61 magnesium alloy, the volume fraction of continuous precipitation was larger than that of discontinuous precipitation. Furthermore, over-aged sample of both alloys were consisted of discontinuous precipitation, continuous precipitation and pre-precipitation area.

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Periodical:

Materials Science Forum (Volumes 783-786)

Pages:

467-471

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.467

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Online since:

May 2014

Authors:

Seiji Saikawa*, Yuhei Ebata, Kiyoshi Terayama, Susumu Ikeno, Emi Yanagihara

Keywords:

Age-Hardening, Casting, Mg-Al-Zn Alloy, Sand Mold

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