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X RAY DIFFRACTION STUDY OF THE THERMALLY INDUCED γ ε MARTENSITIC TRANSFOR MATIONSINFe31 6Mn6 5Si ALLOY

J.X.Zhang1) , K. Tamarat2) and B. Dubois2) 1) Schoolof Material Science & Engineering , Hebei University of Technology , Tianjin 300130 , China2) ISMCM LISSMA , St.Ouen 93407 , France

金属学报(英文版)

Thethermal induced γ εmartensitic transformation in a Fe 31 6 Mn 6 5 Si ( wt% ) alloy wasstudied by meansof X ray diffraction throughtwothermalcyclesin the83 480 Ktem perature range.Itisshownthatduringcoolingtheγ→εtransformationterminatesnotat TγNbutatalowertemperatureandtheγphaseexhibitsstrongstabilityevencoolingto83 K;like wise,εmartensiteis noticeably stable even heating up to 480 K. Atthe temperature about 275 K, an anomalousdecreaseintheintensityofthe(200)γreflections wasobserved on heat ing, whereasthe(101)εreflectionsshow ageneralvariationinintensity.Itisconsideredthat theabnormalphenomenonis probably related tothe magnetictransition of the γphase fromantiferromagnetism to paramagnetism .

关键词: Fe Mn , null , null , null

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