(Hf,Ta)Fe2 magnetic phase transition alloy with zero thermal expansion effect in wide temperature range and applications thereof

Abstract

The invention discloses a (Hf,Ta)Fe2 magnetic phase transition alloy with a zero thermal expansion effect in a wide temperature range and applications thereof. The atomic expression of the magnetic phase transition alloy is Hf0.87Ta0.13Fe2, and the magnetic phase transition alloy has a zero thermal expansion effect in a temperature range of 15K-250K. Hf0.87Ta0.13Fe2 has an extremely low thermal expansion coefficient (alpha=1.5*10<-7>K<-1>) in a temperature range of 124-250K. In the prior art, an alloy with a zero thermal expansion effect is usually prepared by compounding a negative thermal expansion material and a positive thermal expansion material, the preparation technology is complicated, the equipment requirements are high, thus the cost is high, and the prepared alloy only has a zero thermal expansion effect in a narrow temperature range and a large thermal expansion coefficient, so the practical application of the alloy is very difficult. The provided (Hf,Ta)Fe2 magnetic phasetransition alloy has a zero thermal expansion effect in a wide temperature range and an extremely low thermal expansion coefficient and can effectively meet the use requirements therefore.

Description

technical field [0001] The invention relates to a magnetic phase change alloy (Hf, Ta)Fe with zero thermal expansion effect in a wide temperature range 2 The invention and its application belong to the field of phase change alloy preparation. Background technique [0002] Zero thermal expansion materials can be used in the fields of electronics industry, precision measuring tools, precision instruments and low temperature engineering, so they have high application value. At present, zero-expansion materials are usually obtained by combining negative thermal expansion materials and positive thermal expansion materials. However, research in this area has a series of problems such as complex process, high cost, and narrow temperature range. Therefore, the study of zero thermal expansion materials in a wide temperature range is of great significance for practical applications. [0003] (Hf,Ta)Fe 2 Alloys are mainly concerned in the magnetocaloric field, and are a potential m...

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Problems solved by technology

In recent years, scientific research workers have discovered that it has negative thermal expa

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