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A thermodynamic model, into which the nanoscale effect is introduced, is established to describe the thermal parameters of metastable phase, as well as their changes with the concentration, temperature and grain size. Based on the model calculations and experiments, the thermodynamic properties and dependence on the grain size are disclosed. Taking the metastable SmCo7 phase for example, the conditions for the single-phase stability and the phase decomposition are studied. The results are important for the control of the phase stability and phase transformation of the metastable-phase alloy.
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Keywords:
- metastable phase /
- thermodynamics /
- phase stability /
- nanoscale effect
[1] Song X Y, Gao J P, Zhang J X 2005 Acta Phys. Sin. 54 1313 (in Chinese) [宋晓艳, 高金萍, 张久兴 2005 物理学报 54 1313]
[2] Xu W W, Song X Y, Li E D, Wei J, Li L M 2009 Acta Phys. Sin. 58 3280 (in Chinese) [徐文武, 宋晓艳, 李尔东, 魏君, 李凌梅 2009 物理学报 58 3280]
[3] Fultz B 2010 Prog. Mater. Sci. 55 247
[4] Wagner M 1992 Phys. Rev. B 45 635
[5] Song X Y, Zhang J X, Li L M, Yang K Y, Liu G Q 2006 Acta Mater. 54 5541
[6] Xu W W, Song X Y, Lu N D, Huang C 2010 Acta Mater. 58 396
[7] Zhang Z X, Song X Y, Xu W W, Seyring M, Rettenmayr M 2010 Scr. Mater. 62 594
[8] Lu X G, Selleby M, Sundman B 2005 Acta Mater. 53 2259
[9] Meng Q, Zhou N, Rong Y, Chen S, Hsu T Y, Xu Z Y 2002 Acta Mater. 50 4563
[10] Guo J G, Chen N X, Shen J 2006 J. Alloy Compd. 425 14
[11] Barron T, Collins J, White G 1980 Adv. Phys. 29 609
[12] Dinsdale A T 1991 Calphad 15 317
[13] Zhang Z X, Song X Y, Xu W W 2011 Acta Mater. 59 1808
[14] Cullity B D 1995 Elements of X-Ray Diffraction Addition (MA: Wesley Reading)
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[1] Song X Y, Gao J P, Zhang J X 2005 Acta Phys. Sin. 54 1313 (in Chinese) [宋晓艳, 高金萍, 张久兴 2005 物理学报 54 1313]
[2] Xu W W, Song X Y, Li E D, Wei J, Li L M 2009 Acta Phys. Sin. 58 3280 (in Chinese) [徐文武, 宋晓艳, 李尔东, 魏君, 李凌梅 2009 物理学报 58 3280]
[3] Fultz B 2010 Prog. Mater. Sci. 55 247
[4] Wagner M 1992 Phys. Rev. B 45 635
[5] Song X Y, Zhang J X, Li L M, Yang K Y, Liu G Q 2006 Acta Mater. 54 5541
[6] Xu W W, Song X Y, Lu N D, Huang C 2010 Acta Mater. 58 396
[7] Zhang Z X, Song X Y, Xu W W, Seyring M, Rettenmayr M 2010 Scr. Mater. 62 594
[8] Lu X G, Selleby M, Sundman B 2005 Acta Mater. 53 2259
[9] Meng Q, Zhou N, Rong Y, Chen S, Hsu T Y, Xu Z Y 2002 Acta Mater. 50 4563
[10] Guo J G, Chen N X, Shen J 2006 J. Alloy Compd. 425 14
[11] Barron T, Collins J, White G 1980 Adv. Phys. 29 609
[12] Dinsdale A T 1991 Calphad 15 317
[13] Zhang Z X, Song X Y, Xu W W 2011 Acta Mater. 59 1808
[14] Cullity B D 1995 Elements of X-Ray Diffraction Addition (MA: Wesley Reading)
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