Ａｌ‐Ｍｇ‐Ｓｉ系合金の大気環境脆化

• 安藤 誠

  東京大学大学院

• 朝倉 健太郎

  東京大学工学部

• 菅野 幹宏

  東京大学工学部

書誌事項

タイトル別名

• Environmental embrittlement of Al-Mg-Si alloys in air

抄録

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.

収録刊行物

• 軽金属

  軽金属 55 (10), 468-472, 2005

  一般社団法人 軽金属学会

キーワード

• stress corrosion cracking
• hydrogen embrittlement
• intergranular fracture
• excess Si
• Si-rich precipitates

詳細情報

• CRID: 1390282681317616256
• NII論文ID: 130004481704
• DOI: 10.2464/jilm.55.468
• COI: 1:CAS:528:DC%2BD2MXhtlWht7nE
• ISSN: 18808018
• ISSN: 04515994
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可