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<p>Die cast is a promising metal forming process that could potentially replace powder metallurgy for producing high Sc-contained Al-Sc sputtering targets. However, die cast of Al-Sc alloys with Sc contents more than 2 wt.% are not yet investigated. This work optimized the die-casting process parameters of Al-Sc alloys based on the air entrainment ratio and shrinkage porosity through numerical simulation and explored the microstructure and mechanical properties of Al-Sc die castings with Sc contents of 2 wt.%, 5 wt.%, and 10 wt.% by experiments. The results show that the influence weighting of parameters on defects is die temperature &gt; pouring temperature &gt; injection velocity, and the optimum parameter combination is pouring temperature of superheat of 60 ℃, die temperature of 240 ℃, and injection velocity of 3&#xa0;m/s; The solidification structure of Al-Sc die castings comprised equiaxed grains, deformed and partially fragmented columnar grains, and uniformly distributed Al₃Sc precipitates. An increase of Sc content led to grain refinement and a rise in the size and volume fraction of Al₃Sc precipitates. The elongation and tensile strength of Al-Sc die castings were significantly higher than those of gravity castings, whereas these properties diminished with increasing Sc content.</p>

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Optimization of die casting process and microstructure-mechanical properties of Al-Sc alloys

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Yatong Xing,
  • Xiaoxin Zhang,
  • Yanwei Ma,
  • Zhirui Tian,
  • Xia Li,
  • Jianbo Yu,
  • Weidong Xuan,
  • Zhongming Ren

摘要

Die cast is a promising metal forming process that could potentially replace powder metallurgy for producing high Sc-contained Al-Sc sputtering targets. However, die cast of Al-Sc alloys with Sc contents more than 2 wt.% are not yet investigated. This work optimized the die-casting process parameters of Al-Sc alloys based on the air entrainment ratio and shrinkage porosity through numerical simulation and explored the microstructure and mechanical properties of Al-Sc die castings with Sc contents of 2 wt.%, 5 wt.%, and 10 wt.% by experiments. The results show that the influence weighting of parameters on defects is die temperature > pouring temperature > injection velocity, and the optimum parameter combination is pouring temperature of superheat of 60 ℃, die temperature of 240 ℃, and injection velocity of 3 m/s; The solidification structure of Al-Sc die castings comprised equiaxed grains, deformed and partially fragmented columnar grains, and uniformly distributed Al₃Sc precipitates. An increase of Sc content led to grain refinement and a rise in the size and volume fraction of Al₃Sc precipitates. The elongation and tensile strength of Al-Sc die castings were significantly higher than those of gravity castings, whereas these properties diminished with increasing Sc content.