Influence of added fourth elements on creep properties of heat-resistant Al-Mg-Zn ternary alloys at 200°C

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  • Kondo Masaaki
    Toyota Industries Corporation
  • Suzuki Tomohiro
    Toyota Industries Corporation
  • Li Ruoqi
    Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University Graduate student, Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University
  • Takata Naoki
    Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University

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Other Title
  • 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

Abstract

<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>

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