Significantly Promoting the Thermal Conductivity and Machinability of Negative Thermal Expansion Alloy via In Situ Precipitation of Copper Networks

Minjun Ai, Yuzhu Song, Feixiang Long, Yuanpeng Zhang, Ke An, Dunji Yu, Yan Chen, Yuki Sakai, Masahito Ikeda, Kazuki Takahashi, Masaki Azuma, Naike Shi, Chang Zhou, Jun Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Rapid advancements in electronic devices yield an urgent demand for high-performance electronic packaging materials with high thermal conductivity, low thermal expansion, and great mechanical properties. However, it is a great challenge for current design philosophies to fulfill all the requirements simultaneously. Here, an effective strategy is proposed for significantly promoting the thermal conductivity and machinability of negative thermal expansion alloy (Zr,Nb)Fe2 through eutectic precipitation of copper networks. The eutectic dual-phase alloy exhibits an isotropic chips-matched thermal expansion coefficient and a thermal conductivity enhancement exceeding 200% compared with (Zr,Nb)Fe2, along with an ultimate compressive strength of 550 MPa. The addition of copper reorganizes the composition of (Zr,Nb)Fe2, which smooths the magnetic transition and shifts it toward higher temperature, resulting in linear low thermal expansion in a wide temperature range. The highly fine eutectic copper lamellae construct high thermal conductivity networks within (Zr,Nb)Fe2, serving as highways for heat transfer electrons and phonons. The in situ forming of eutectic copper lamellae also facilitates the mechanical properties by enhancing interfacial bonding and bearing additional stress after yielding of (Zr,Nb)Fe2. This work provides a novel strategy for promoting thermal conductivity and mechanical properties of negative thermal expansion alloys via eutectic precipitation of copper networks.

Original languageEnglish
Article number2404838
JournalAdvanced Science
Volume11
Issue number40
DOIs
StatePublished - Oct 28 2024

Funding

This work was supported by the National Key R&D Program of China (2022YFE0109100), and the National Natural Science Foundation of China (22235002, 22275014, 22205016, and 12104038). The synchrotron-radiation experiments were performed at SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (2022A17752). In situ neutron diffraction work was carried out at the VULCAN (Proposal: 29886.1), Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL). The authors acknowledge Dr. Chinwei Wang for collecting the NPD data at the high-intensity diffractometer Wombat of the Australian Nuclear Science and Technology Organisation (ANSTO). The authors acknowledge Prof. Xianran Xing for providing laboratory X-ray diffraction and macroscopic magnetic tests at the Institute of Solid State Chemistry, University of Science and Technology Beijing. This work was supported by the National Key R&D Program of China (2022YFE0109100), and the National Natural Science Foundation of China (22235002, 22275014, 22205016, and 12104038). The synchrotron\u2010radiation experiments were performed at SPring\u20108 with the approval of the Japan Synchrotron Radiation Research Institute (2022A17752). In situ neutron diffraction work was carried out at the VULCAN (Proposal: 29886.1), Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL). The authors acknowledge Dr. Chinwei Wang for collecting the NPD data at the high\u2010intensity diffractometer Wombat of the Australian Nuclear Science and Technology Organisation (ANSTO). The authors acknowledge Prof. Xianran Xing for providing laboratory X\u2010ray diffraction and macroscopic magnetic tests at the Institute of Solid State Chemistry, University of Science and Technology Beijing.

Keywords

  • copper networks
  • eutectic precipitation
  • high thermal conductivity
  • negative thermal expansion

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