Scholarlink

<p>Although metallic glasses (MGs) possess relatively low thermal expansion coefficient (<i>α</i>) compared to their crystalline counterparts due to the existence of free volume, their <i>α</i>-values are still too large to meet the demands of practical application. Here, we report that a bi-material structure (BMS) consisting of curved traditional materials (e.g., Al alloy) with MGs can be used to obtain tunable <i>α</i> while maintaining high structural stiffness. The curved Al alloy has a pulling effect on the MGs when the curvature changes, limiting the thermal expansion of MGs. Through the theoretical model and finite element method analysis, it is further found that both <i>α</i> and stiffness can be significantly altered through changing the degree of curvature, the contact surface, and the thickness ratio of MG over Al alloy. The present study not only offers a solution to the <i>α</i> reduction of MGs but also suggests that BMS can be used to design advanced structural materials that possess adjustable <i>α</i> and high stiffness.</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

A structural design approach toward metallic glass with simultaneous tunable thermal expansion and high structural stiffness

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月28日

查看全文
  • Yunhao Zhang,
  • Ye Zhou,
  • Conghao Xu,
  • Jiacheng Zhang,
  • Zhendong Sha

摘要

Although metallic glasses (MGs) possess relatively low thermal expansion coefficient (α) compared to their crystalline counterparts due to the existence of free volume, their α-values are still too large to meet the demands of practical application. Here, we report that a bi-material structure (BMS) consisting of curved traditional materials (e.g., Al alloy) with MGs can be used to obtain tunable α while maintaining high structural stiffness. The curved Al alloy has a pulling effect on the MGs when the curvature changes, limiting the thermal expansion of MGs. Through the theoretical model and finite element method analysis, it is further found that both α and stiffness can be significantly altered through changing the degree of curvature, the contact surface, and the thickness ratio of MG over Al alloy. The present study not only offers a solution to the α reduction of MGs but also suggests that BMS can be used to design advanced structural materials that possess adjustable α and high stiffness.