Environmental embrittlement of Al-Mg-Si alloys in air

DOI 3 Citations 7 References

Bibliographic Information

Other Title
  • Ａｌ‐Ｍｇ‐Ｓｉ系合金の大気環境脆化

Abstract

Environmental embrittlement was studied by use of round tensile specimens of two kinds of alloys: Al-1.12 mass%Mg2Si-0.35Si (S-alloy) and Al-1.47%Mg2Si-0.34%Cu (BC-alloy). They were solution treated at 540°C for 1 h, quenched in water and aged at 175°C for indicated times: 30 min (under aging), 103 min (peak aging), and 104 min (over aging). After heat treating, they were tested at an initial strain rate of 1.7×10-4/s or 1.7×10-7/s in a laboratory air with relative humidity of about 100%. When tested at the strain rate of 1.7×10-7/s, the peak aged S-alloy showed embrittlement with lower tensile elongation and reduction in area compared with a strain rate of 1.7×10-4/s. The embrittlement also appeared on the other aging conditions (under aging, over aging), and it was most apparent on over-aged alloy despite their lower tensile strength. By means of EDS analysis, Si-rich precipitates were detected on intergranular fracture surface of over-aged alloy. In contrasted to foregoing experimental results on S alloy, no embrittlement appeared in the BC-alloy irrespective of aging condition. Thus, the embrittlement is thought to be stimulated by the Si-rich precipitates which are increased with the progress of aging.

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Details 詳細情報について

  • CRID
    1390282681317616256
  • NII Article ID
    130004481704
  • DOI
    10.2464/jilm.55.468
  • COI
    1:CAS:528:DC%2BD2MXhtlWht7nE
  • ISSN
    18808018
    04515994
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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