Resolution of a discrepancy of magnetic mechanism for Elinvar anomaly in Fe-Ni based alloys
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摘要
Fe-Ni based Elinvar alloys performing temperature-independent elastic modulus over a wide temperature range have found wide and significant applications. Although numerous models involved with magnetism have been proposed to explain the Elinvar anomaly, some of the puzzles concerning the anomaly have not been fully understood. In this work, a remarkable discrepancy between the inflection temperature of modulus and the Curie temperature in a typical Fe-Ni-Cr Elinvar alloy was found,challenging the magnetic mechanism for Elinvar anomaly. Microstructural characterization and dynamic mechanical analysis demonstrate the occurrence of a strain glass transition with continuous formation of nanodomains. Accompanying such a transition, the gradual softening in the elastic modulus of austenite offsets the modulus hardening due to the vibrational anharmonicity of nanodomains upon cooling, leading to the Elinvar effect. As a result, the inflection temperature of modulus corresponds to the initiation of nanodomains' formation instead of magnetic transition. Our findings specify the association of Elinvar anomaly with structural aspects, and provide new insights into the mechanism of Elinvar anomaly in Fe-Ni based alloy.
Fe-Ni based Elinvar alloys performing temperature-independent elastic modulus over a wide temperature range have found wide and significant applications. Although numerous models involved with magnetism have been proposed to explain the Elinvar anomaly, some of the puzzles concerning the anomaly have not been fully understood. In this work, a remarkable discrepancy between the inflection temperature of modulus and the Curie temperature in a typical Fe-Ni-Cr Elinvar alloy was found,challenging the magnetic mechanism for Elinvar anomaly. Microstructural characterization and dynamic mechanical analysis demonstrate the occurrence of a strain glass transition with continuous formation of nanodomains. Accompanying such a transition, the gradual softening in the elastic modulus of austenite offsets the modulus hardening due to the vibrational anharmonicity of nanodomains upon cooling, leading to the Elinvar effect. As a result, the inflection temperature of modulus corresponds to the initiation of nanodomains' formation instead of magnetic transition. Our findings specify the association of Elinvar anomaly with structural aspects, and provide new insights into the mechanism of Elinvar anomaly in Fe-Ni based alloy.
Fe-Ni based Elinvar alloys performing temperature-independent elastic modulus over a wide temperature range have found wide and significant applications. Although numerous models involved with magnetism have been proposed to explain the Elinvar anomaly, some of the puzzles concerning the anomaly have not been fully understood. In this work, a remarkable discrepancy between the inflection temperature of modulus and the Curie temperature in a typical Fe-Ni-Cr Elinvar alloy was found,challenging the magnetic mechanism for Elinvar anomaly. Microstructural characterization and dynamic mechanical analysis demonstrate the occurrence of a strain glass transition with continuous formation of nanodomains. Accompanying such a transition, the gradual softening in the elastic modulus of austenite offsets the modulus hardening due to the vibrational anharmonicity of nanodomains upon cooling, leading to the Elinvar effect. As a result, the inflection temperature of modulus corresponds to the initiation of nanodomains' formation instead of magnetic transition. Our findings specify the association of Elinvar anomaly with structural aspects, and provide new insights into the mechanism of Elinvar anomaly in Fe-Ni based alloy.
引文
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[6]E.P.Wohlfarth,Physica Status Solidi A:Appl.Res.10(1972)K39-K42.
[7]G.Hausch,J.Magn.Magn.Mater.10(1979)163-169.
[8]G.Hausch,Physica Status Solidi A:Appl.Res.15(1973)501-510.
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[10]R.J.Weiss,Proc.Phys.Soc.82(1963)281.
[11]F.R.Sami Mahmood,A.F.Lehlooh,S.Mahmoud,Abhath al Yarmouk,Pure Sci.Eng.4(1995)61-76.
[12]N.Cowlam,A.R.Wildes,J.Phys.15(2003)521.
[13]J.W.Lynn,N.Rosov,M.Acet,H.Bach,J.Appl.Phys.75(1994)6069-6071.
[14]O.A.Khomenko,I.F.Khil’kevich,Met.Sci.Heat Treat.23(1981)211-214.
[15]G.Hausch,Physica Status Solidi A:Appl.Res.29(1975)K149-K153.
[16]G.Hausch,J.Phys.F 6(1976)1015.
[17]V.M.Nadutov,A.I.Ustinov,S.A.Demchenkov,Y.O.Svystunov,V.S.Skorodzievski,J.Mater.Sci.Technol.31(2015)1079-1086.
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[19]E.Hayes,A.Miodownik,IEEE Trans.Magn.11(1975)1347-1349.
[20]T.Yasunori,S.Yuki,M.Hiroshi,J.Jpn.Inst.Met.34(1970)417-421.
[21]J.B.Wachtman,W.E.Tefft,D.G.Lam,C.S.Apstein,Phys.Rev.122(1961)1754-1759.
[22]Y.Zhou,D.Xue,Y.Tian,X.Ding,S.Guo,K.Otsuka,J.Sun,X.Ren,Phys.Rev.Lett.112(2014),025701.
[23]J.Zhang,Y.Wang,X.Ding,Z.Zhang,Y.Zhou,X.Ren,D.Wang,Y.Ji,M.Song,K.Otsuka,J.Sun,Phys.Rev.B 84(2011),214201.
[24]Y.Wang,D.Wang,Y.Zhou,J.Zhang,D.Xue,X.Ren,in:A.Saxena,A.Planes(Eds.),Modeling and Applications,Springer Berlin Heidelberg,Berlin,Heidelberg,2014,pp.271-288.
[25]S.Sarkar,X.Ren,K.Otsuka,Phys.Rev.Lett.(2005)95,205702.
[26]X.Ren,Phys.Status Solidi B 251(2014)1982-1992.
[27]J.A.Mydosh,London,in:Spin Glass:An Experimental Introduction,Taylor&Francis,1993.
[28]J.C.Qiao,J.M.Pelletier,J.Mater.Sci.Technol.30(2014)523-545.
[29]X.Ren,in:T.Kakeshita,T.Fukuda,A.Saxena,A.Planes(Eds.),Disorder and Strain-Induced Complexity in Functional Materials,Springer Berlin Heidelberg,Berlin,Heidelberg,2012,pp.201-225.
[30]K.Otsuka,X.Ren,Prog.Mater.Sci.50(2005)511-678.
[31]C.Zener,Elasticity and Anelasticity of Metals,University of Chicago Press,Chicago,1948.
[32]Y.L.Hao,H.L.Wang,T.Li,J.M.Cairney,A.V.Ceguerra,Y.D.Wang,Y.Wang,D.Wang,E.G.Obbard,S.J.Li,R.Yang,J.Mater.Sci.Technol.32(2016)705-709.
[33]Y.Wang,J.Gao,H.Wu,S.Yang,X.Ding,D.Wang,X.Ren,Y.Wang,X.Song,J.Gao,Sci.Rep.4(2014)3995.
[34]L.Zhang,D.Wang,X.Ren,Y.Wang,Sci.Rep.5(2015)11477.
[35]Y.Ji,X.Ding,T.Lookman,K.Otsuka,X.Ren,Phys.Rev.B 87(2013),104110.
[36]J.Zhang,D.Xue,X.Cai,X.Ding,X.Ren,J.Sun,Acta Mater.120(2016)130-137.
[37]T.B.Massalski,D.E.Laughlin,Calphad 33(2009)3-7.