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Nb摻雜Gd合金的大磁熱效應(yīng)和顯微硬度增強(qiáng)
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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 (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 Improved Microhardness of Nb-doped Gd Alloys
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    摘要:

    在氬氣氣氛中用熔煉法制備了Gd100-xNbx (x=0, 1, 2, 3, 5)系列合金，鑄錠經(jīng)1273 K均勻化退火96 h后水淬至室溫。結(jié)果表明：Gd100-xNbx 系列合金仍保持純Gd的六方相結(jié)構(gòu)；Nb摻雜合金的居里溫度比純Gd均低2 K，在居里點(diǎn)附近發(fā)生的磁性轉(zhuǎn)變?yōu)槎壪嘧儯? T外場下的最大磁熵變約為純Gd的85%。通過少量Nb (≤5at%) 摻雜后，Gd100-xNbx系列合金的顯微硬度明顯得到提高，與純Gd相比，顯微硬度最大提高幅度達(dá)~53% (x=5)。含少量Nb的Gd100-xNbx合金具有較大的磁熵變和較好的加工性能，是一類有很大應(yīng)用潛力的室溫磁致冷材料

    Abstract:

    A series of Gd1- xNbx(x=0, 1, 2, 3, 5) alloys were prepared by arc melting in purified argon atmosphere. The ingots were heat-treated at 1273K for 96h followed by water quenching to homogenize the microstructure. All Gd1-xNbx alloys with various Nb doping keep the hexagonal crystal structure of pure Gd. The Curie temperatures Tc of the Nb-doped alloys are lower than that of Gd by ~2 K and the magnetic transition occurring in the vicinity of Tc is a second order transformation. The maximum entropy changes of Gd1-xNbx alloys under 5 T magnetic field are about 85% of that of pure Gd. The microhardness of Gd1- xNbx alloys is greatly improved by doping a small amount of Nb (≤5 at%). Comparing with pure Gd, the microhardness increases by about 53% for Gd1-xNbx alloys with x=5. The present results indicate that the Gd1- xNbx alloys with small amounts of Nb doping have large values of magnetic entropy change and good processing properties, they are possessed of great potential in room-temperature magnetic refrigeration applications

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唐鵬飛,鐘喜春,鄭志剛,余紅雅,邱萬奇,曾德長,劉仲武. Nb摻雜Gd合金的大磁熱效應(yīng)和顯微硬度增強(qiáng)[J].稀有金屬材料與工程,2012,41(6):1090~1093.[Tang Pengfei, Zhong Xichun, Zheng Zhigang, Yu Hongya, Qiu Wanqi, Zeng Dechang, Liu Zhongwu. Large Magnetocaloric Effect and Improved Microhardness of Nb-doped Gd Alloys[J]. Rare Metal Materials and Engineering,2012,41(6):1090~1093.]
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  • 收稿日期:2011-06-20
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