Unveiling the Origin of the Strengthening Mechanism in a Novel Precious Metal Multi-Principal Elements Alloy

IF 14.3 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Xuan Zhou, Hualong Ge, Kai Xiong, Junjie He, Shunmeng Zhang, Li Fu, Zhilong Tan, Xiaofei Wu, Xuming Li, Haijun Wu, Junmei Guo, Yong Mao
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Abstract

Precious metal electrical contact materials are pivotal in microelectronic devices due to their excellent chemical stability and electrical properties. Their practical application is hindered by the strength, contact resistance, and high cost. Multi-principal elements alloys (MPEAs) provide the possibility to develop cost-effective materials with enhanced mechanical properties. To address this, a novel precious metal MPEA, PdAgCuAuPtZn alloy, is designed, which exhibits significant solid solution strengthening and aging strengthening effects. The ultimate tensile strength increases from 747 MPa in the solution state to 1126 MPa in the aged state, while resistivity remains low. This study presents the first systematic investigation into the strengthening mechanisms of precious metal MPEAs using nanoindentation technology. These findings indicate that the aging strengthening of the alloy is attributed to spinodal decomposition (SD) and chemical short-range order (CSRO) in the matrix. Furthermore, the precipitation structure with Cu-rich and Ag-rich phases gradually replaces the matrix, primarily accounting for aging softening. Additionally, it is discovered that precipitation structure can be strengthened by CSRO formed in the Cu-rich phase, thus providing an innovative strengthening in PdAgCuAuPtZn alloy. These results will be beneficial to both deeply understanding the aging behaviors of PdAgCuAuPtZn alloys and designing high-performance precious metal MPEAs.

Abstract Image

揭示一种新型贵金属多主元素合金强化机理的起源。
贵金属电接触材料以其优异的化学稳定性和电学性能在微电子器件中占有重要地位。它们的实际应用受到强度、接触电阻和高成本的阻碍。多主元素合金(mpea)提供了开发具有增强机械性能的经济高效材料的可能性。为了解决这一问题,设计了一种新型贵金属MPEA——PdAgCuAuPtZn合金,该合金具有显著的固溶强化和时效强化效果。抗拉强度由溶解态的747 MPa提高到时效态的1126 MPa,而电阻率保持在较低水平。本研究首次采用纳米压痕技术对贵金属mpea的强化机理进行了系统的研究。这些结果表明,合金的时效强化是由基体中的旋多分解(SD)和化学短程有序(CSRO)引起的。富cu和富ag相的析出结构逐渐取代基体,这是时效软化的主要原因。此外,发现富cu相中形成的CSRO可以强化析出结构,从而为PdAgCuAuPtZn合金提供了一种创新的强化方法。这些结果将有助于深入了解PdAgCuAuPtZn合金的时效行为,并有助于设计高性能贵金属mpea。
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来源期刊
Advanced Science
Advanced Science CHEMISTRY, MULTIDISCIPLINARYNANOSCIENCE &-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
18.90
自引率
2.60%
发文量
1602
审稿时长
1.9 months
期刊介绍: Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.
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