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Gd99.75Fe0.25合金的大磁熱效應(yīng)及應(yīng)用特性研究
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廣東省科技計(jì)劃項(xiàng)目（2010B050300008，2007B010600043）；廣東省教育部產(chǎn)學(xué)研結(jié)合項(xiàng)目（2010A090200042, 2009B090300273）；國家自然科學(xué)基金（U0734001，50874050）；中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目（2009ZM0291，2009ZZ0025，2009ZM0247）


Large Magnetocaloric Effect and Application Features of Gd99.75Fe0.25 Alloy
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    摘要:

    采用X射線衍射、物理性能測(cè)試系統(tǒng)、顯微硬度計(jì)及電化學(xué)工作站研究了經(jīng)氬弧熔煉、1123 K均勻化熱處理168 h的 Gd99.75Fe0.25合金的磁熱效應(yīng)及應(yīng)用特性。結(jié)果表明：Gd99.75Fe0.25合金仍保持純Gd的六方晶體結(jié)構(gòu)；Gd99.75Fe0.25合金的居里溫度為294 K，且在居里點(diǎn)附近發(fā)生鐵磁到順磁的二級(jí)相變，2和5 T外場(chǎng)下的最大磁熵變分別為4.99和9.37 J·kg-1·K-1，均大于純Gd；Gd99.75Fe0.25合金的顯微硬度（HV0.2）590 MPa，與純Gd相當(dāng)，但少量Fe的摻雜提高了Gd的耐蝕性。含少量Fe的Gd99.75Fe0.25合金具有大的磁熱效應(yīng)及良好的應(yīng)用特性，是一種有很大應(yīng)用潛力的室溫磁致冷材料。

    Abstract:

    Gd99.75Fe0.25 alloy prepared by arc melting under purified argon atmosphere and homogenization annealing treatment at 1123 K for 168 h was investigated by X-ray diffraction, physical property measurement system, microhardness tester and electrochemical workstation. The results show that the Gd99.75Fe0.25 alloy still retains hexagonal crystal structure of pure Gd. The Curie temperature of Gd99.75Fe0.25 alloy is 294 K, and the alloy exhibits a second-order magnetic transition from ferromagnetism to paramagnetism. The maximum magnetic entropy changes of Gd99.75Fe0.25 alloy under magnetic field changes of 0~2 T and 0~5 T are 4.99 J·kg-1·K-1 and 9.37 J·kg-1·K-1, respectively, which are larger than that of pure Gd. The micro-hardness (HV0.2) of Gd99.75Fe0.25 alloy is 590 MPa, which is equivalent to that of pure Gd. But the corrosion resistance is improved by doping a small amount of Fe. Large magnetocaloric effect and good application features make the Gd99.75Fe0.25 alloy as a potential magnetic refrigerant at room temperature.

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閔繼雄,鐘喜春,鄭志剛,劉仲武,曾德長,余紅雅,邱萬奇. Gd99.75Fe0.25合金的大磁熱效應(yīng)及應(yīng)用特性研究[J].稀有金屬材料與工程,2013,42(2):362~365.[Min Jixiong, Zhong Xichun, Zheng Zhigang, Liu Zhongwu, Zeng Dechang, Yu Hongya, Qiu Wanqi. Large Magnetocaloric Effect and Application Features of Gd99.75Fe0.25 Alloy[J]. Rare Metal Materials and Engineering,2013,42(2):362~365.]
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  • 收稿日期:2012-02-24
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