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<p>Endowing functional properties with mechanical responses in traditional metals has been a frontier topic, akin to transforming base metal into gold. Chromium and its alloys, with their functional deficiencies and limited ductility, serve as typical examples. Herein, we report a Cr<sub>96</sub>Fe<sub>4</sub>Ge<sub>1.3</sub>B<sub>1</sub> alloy that unifies low thermal expansion (LTE, α<sub><i>l</i></sub> = 1.79 × 10<sup>-6 </sup>K<sup>-1</sup>, 200 − 315 K) with exceptional toughness (240.2 J·cm<sup>-3</sup>). The enhancement in mechanical responses is primarily attributed to layered Cr<sub>2</sub>B intermetallic precipitates, which ameliorate interfacial cohesion and simultaneously refine the grain structure. The weakened interlayer interactions within the Cr-B layers facilitate the nucleation and movement of numerous tiny stacking faults in precipitates, efficiently alleviating strain energy and resulting in marked work-hardening ability. Additionally, antiferromagnetic fluctuations in the BCC matrix contribute to the unique LTE behavior. This paves the way for the design of high-performance alloys featuring layered-symmetry precipitates.</p>

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Atomic faulting drives exceptional toughness in low thermal expansion chromium alloys

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月6日

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  • Chengyi Yu,
  • Honghui Wu,
  • Huihui Zhu,
  • Xin Chen,
  • Qinghua Zhang,
  • Yujie Chen,
  • Lin Gu,
  • Qiang Zhang,
  • Matthias D. Frontzek,
  • Yan Chen,
  • Ke An,
  • Lunhua He,
  • Kenichi Kato,
  • Shogo Kawaguchi,
  • Zeyu Qiao,
  • Meisa Zhou,
  • Yili Cao,
  • Qiang Li,
  • Jinxia Deng,
  • Kun Lin,
  • Xianran Xing

摘要

Endowing functional properties with mechanical responses in traditional metals has been a frontier topic, akin to transforming base metal into gold. Chromium and its alloys, with their functional deficiencies and limited ductility, serve as typical examples. Herein, we report a Cr96Fe4Ge1.3B1 alloy that unifies low thermal expansion (LTE, αl = 1.79 × 10-6 K-1, 200 − 315 K) with exceptional toughness (240.2 J·cm-3). The enhancement in mechanical responses is primarily attributed to layered Cr2B intermetallic precipitates, which ameliorate interfacial cohesion and simultaneously refine the grain structure. The weakened interlayer interactions within the Cr-B layers facilitate the nucleation and movement of numerous tiny stacking faults in precipitates, efficiently alleviating strain energy and resulting in marked work-hardening ability. Additionally, antiferromagnetic fluctuations in the BCC matrix contribute to the unique LTE behavior. This paves the way for the design of high-performance alloys featuring layered-symmetry precipitates.