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Titolo:
The influence of temperature on stacking fault energy in Fe-based alloys
Autore:
Wan, JF; Chen, SP; Xu, ZY;
Indirizzi:
Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China Shanghai Jiao Tong Univ Shanghai Peoples R China 200030 Peoples R China
Titolo Testata:
SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES
fascicolo: 4, volume: 44, anno: 2001,
pagine: 345 - 352
SICI:
2095-0624(200108)44:4<345:TIOTOS>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHAPE-MEMORY ALLOYS; SYSTEM;
Keywords:
stacking fault energy(SFE); temperature; Fe-based alloys; segregation; magnetic contribution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Xu, ZY Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China Shanghai Jiao Tong Univ Shanghai Peoples R China 200030 s R China
Citazione:
J.F. Wan et al., "The influence of temperature on stacking fault energy in Fe-based alloys", SCI CHINA E, 44(4), 2001, pp. 345-352

Abstract

Temperature has great influence on the stacking fault energy (SFE). Both SFE and d gamma (0)/d T for Fe-based alloys containing substitutional or interstitial atoms increase with increasing temperature. Based on the thermodynamic model of SFE, the equation d gamma (0)/d T = d gamma (ch)/d T + d gamma (seg)/d T + d gamma (MG)/d T and those expressions for three items involved are established. The calculated d gamma (0)/d T is generally consistentwith the experimental. The influence of chemical free energy on the temperature dependence of SFE is almost constant, and is obviously stronger than that of magnetic and segregation contributions. The magnetic transition andthe segregation of alloying elements at stacking faults cause a decrease in SFE of the alloys when temperature increases; that is, d gamma (MG)/d T <0 and d<gamma>(seg)/d T < 0. Meanwhile, such an influence decreases with increasing temperature, except for the d<gamma>(seg)/d T of Fe-Mn-Si alloys. With these results, the experimental phenomena that the SFE of Fe-based alloys is not zero at the thermodynamically equilibrated temperature (T-0) ofthe gamma and epsilon phases and they are positive both at T > T-0 and T <T-0 can be reasonably explained.

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Documento generato il 24/01/20 alle ore 12:44:13