Scholarlink

<p>The creep behavior of Mg-modified hypoeutectic Al-7Si alloys was systematically characterized via room-temperature nanoindentation, specifically elucidating the influence of heat treatment and magnesium modification. Minor additions of Mg promote a transition toward a more equiaxed α-Al grain morphology. Additionally, T6 heat treatment substantially refines and spheroidizes the eutectic Si phase, thereby enhancing microstructural homogeneity. These microstructural modifications facilitate dislocation pileup at phase boundaries, effectively impeding dislocation mobility under load and thereby enhancing creep resistance. The T6 Al-7Si-Mg alloy exhibited superior creep resistance, notably at higher strain rates where elevated stress facilitates rapid dislocation nucleation and increased dislocation density. Furthermore, the creep stress exponent displayed a non-monotonic dependence on indentation depth. This behavior is attributed to the evolving interaction between the indentation-induced stress field and the Al-Si phase boundaries.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The Microstructure and the Room-Temperature Nanoindentation Creep Behavior of Mg Modified Al-7Si Alloys

  • 期刊论文

  • 发表日期：

    2026年2月28日

查看全文
  • Pengwei Zhao,
  • Xuegang Xing,
  • Shun Xing,
  • Buyun Su,
  • Gesheng Xiao,
  • Yongsheng Wang

摘要

The creep behavior of Mg-modified hypoeutectic Al-7Si alloys was systematically characterized via room-temperature nanoindentation, specifically elucidating the influence of heat treatment and magnesium modification. Minor additions of Mg promote a transition toward a more equiaxed α-Al grain morphology. Additionally, T6 heat treatment substantially refines and spheroidizes the eutectic Si phase, thereby enhancing microstructural homogeneity. These microstructural modifications facilitate dislocation pileup at phase boundaries, effectively impeding dislocation mobility under load and thereby enhancing creep resistance. The T6 Al-7Si-Mg alloy exhibited superior creep resistance, notably at higher strain rates where elevated stress facilitates rapid dislocation nucleation and increased dislocation density. Furthermore, the creep stress exponent displayed a non-monotonic dependence on indentation depth. This behavior is attributed to the evolving interaction between the indentation-induced stress field and the Al-Si phase boundaries.