Al-Mg-Zn3元系耐熱合金の200°Cにおけるクリープ特性に及ぼす第4元素添加の影響

  • 近藤 雅晶
    株式会社豊田自動織機
  • 鈴木 智博
    株式会社豊田自動織機
  • 黎 若琪
    名古屋大学 大学院工学研究科 物質プロセス工学専攻 名古屋大学 大学院工学研究科 物質プロセス工学専攻 大学院生
  • 高田 尚記
    名古屋大学 大学院工学研究科 物質プロセス工学専攻

書誌事項

タイトル別名
  • Influence of added fourth elements on creep properties of heat-resistant Al-Mg-Zn ternary alloys at 200°C

抄録

<p>The effect of Cu or Ni addition on creep properties of a heat-resistant aluminum (Al) alloy (with a composition of Al-5Mg-3.5Zn (mol%)) strengthened by precipitates of T-Al6Mg11Zn11 intermetallic phase was investigated. The quaternary alloys with various Cu contents (0.25-3 mol%) or Ni contents (0.5-2 mol%) were solution-treated at 470°C and then aged at 200°C for 10 hours. The creep tests were conducted using the heat-treated specimens at 200°C under 105 MPa. Both Cu and Ni additions increased the creep rupture time. The 1 mol% Cu added alloy exhibited the longest creep rupture time due to the enhanced precipitation of the refined intragranular phases (T or MgZn2 phases). However, more than 2 mol% Cu addition led to the transition of T phase to S-Al2CuMg phase formed on grain boundaries. The phase transition might have a detrimental effect on creep rupture time. In the Ni-added alloy specimen, the creep rupture time became longest when 1 mol% Ni was added. The added Ni element promoted the formation of the Al3Ni phase on the grain boundaries, resulting in the suppression of connecting cavities formed on grain boundaries in creep deformation.</p>

収録刊行物

  • 軽金属

    軽金属 72 (8), 473-481, 2022-08-15

    一般社団法人 軽金属学会

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