He Wang, Yi-Han Wang, Yuan-Yuan Gong, Gui-Zhou Xu, Er Liu, Xue-Fei Miao, Yu-Jing Zhang, Yan-Yan Shao, Jun Liu, Najam UI Hassan, Ishfaq Ahmad Shah, Feng Xu
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引用次数: 0
Abstract
MgZn2-type (Hf,Ta)Fe2, known for its negative thermal expansion during magnetic transition, is a key component in the production of zero thermal expansion composites. This paper presents a basic approach for designing such composites by introducing an additional Laves phase through atomic substitution. Specifically, Co, Ni, Al and V were chosen to substitute Fe in (Hf,Ta)Fe2. The addition of Co or Ni results in the creation of an extra MgCu2 (C15) phase in the MgZn2 (C14) matrix. The C15 phase exhibits positive thermal expansion, which effectively compensates for the negative thermal expansion of the C14 matrix. By adjusting the amount of Co or Ni, zero thermal expansion can be achieved in a given temperature range. Meanwhile, the replacement of Fe by Al or V yields another C14 phase with a higher doping element content relative to the C14 matrix. These two C14 phases possess different magnetic transition temperatures and negative thermal expansion temperature regions. The combination of the two C14 phases results in zero thermal expansion due to the effective thermal expansion compensation between them. Our results serve to identify potential approaches for designing (Hf,Ta)Fe2-based zero thermal expansion composites.
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.