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Al-Cu-Ge alloy system, a typical ternary eutectic alloy system, has been used widely in the industries. Our research is helpful for better understanding its thermophysical properties and improving its structural performance. In this paper, the specific heat values and thermal expansion coefficients of Al55Cu10Ge35, Al70Cu10Ge20 and Al80Cu10Ge10 alloys are investigated. The microstructural characteristics and the solidification paths of these alloys under near-equilibrium solidification and rapid solidification conditions are studied comparatively. Their specific heat values increase as Al content increases and Ge content decreases. The softening temperature is 666 K, and the thermal expansion coefficient fluctuates around 1.5×10-5 K-1 in the temperature range of 370–650 K. Under a near-equilibrium solidification condition, the last formation microstructure is (Al)+(Ge) pseudobinary eutectic instead of ternary eutectic. This means that (Al), (Ge), and CuAl2 phases are difficult to nucleate simultaneously or grow cooperatively. In comparison, during rapid solidification, the nucleation of primary phase is depressed, pseudobinary eutectic and ternary eutectic are much easier to form in these alloys.
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Keywords:
- specific heat /
- thermal expansion coefficient /
- rapid solidification /
- undercooling
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[10] Ruan Y, Lu X Y 2012 J. Alloys Compd. 542 232
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[12] Yi X H, Liu R S, Tian Z A, Hou Z Y, Wang X, Zhou Q Y 2006 Acta Phys. Sin. 55 5386 (in Chinese) [易学华, 刘让苏, 田泽安, 侯兆阳, 王鑫, 周群益 2006 55 5386]
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[14] Qu M, Liu L, Zhao M 2010 International Conference on Advances in Materials and Manufacturing Processes ShenZhen, Peoples R China, November 6-8, 2010 p729
[15] Xu R, Zhao H, Li J, Liu R, Wang W K 2006 Mater. Lett. 60 783
[16] Anusionwu B C, Adebayo G A, Madu C A 2009 Appl. Phys. A 97 533
[17] Kanibolotsky D S, Bieloborodova O V, Kotova N V, Lisnyak V V 2002 J. Therm. Anal. Calorim. 70 975
[18] Zhou X 2011 Trans. Nonferrous Met. Soc. China 21 1513 (in Chinese) [周娴 2011 中国有色金属学报 21 1513]
[19] Zhang X L, He D Y, Li X Y, Jiang J M 2009 Mater. Sci. Technol. 17 65 (in Chinese) [张晓丽, 贺定勇, 李晓延, 蒋建敏 2009 材料科学与工艺 17 65]
[20] Stadnik Z M, Stroink G 1991 Phys. Rev. B 43 894
[21] Kanibolotsky D S, Kotova N V, Bieloborodova O A, Lisnyak V V 2003 J. Chem. Therm. 35 1763
[22] Villars P, Prince A, Okamoto H 1997 Ternary Alloy Phase Diagrams (2nd Ed.) (New York: ASM International) p3216
[23] Brandes E A, Brook G B 1992 Smithells Metals Reference Book (7th Ed.) (Great Britain: Bath) pp8-41
[24] Lee E, Ahn S 1994 Acta Metall. Mater. 42 3231
[25] Dragnevski K, Cochrane R F, Mullis A M 2002 Phys. Rev. Lett. 89 215502
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[1] Sun J Q, Zhong R P 2007 Ptca(Part: A Phys. Test.) 43 112 (in Chinese) [孙建强, 钟润萍 2007 理化检验-物理分册 43 112]
[2] Yan J, Shan L, Luo Q, Wang W H, Wen H H 2009 Chin. Phys. B 18 704
[3] Wu M M, Peng J, Cheng Y Z, Xiao X L, Chen D F, Hu Z B 2013 J. Alloys Compd. 577 295
[4] Rudajevová A 2007 J. Alloys Compd. 430 153
[5] Wang B L, Mai Y W, Zhang X H 2004 Acta Mater. 52 4961
[6] Sayir A, Farmer S C 2000 Acta Mater. 48 4691
[7] Shabestari S G, Moemeni H 2004 J. Mater. Process. Tech. 153 193
[8] Luo A A, Fu P H, Peng L M, Kang X Y, Li Z Z, Zhu T Y 2011 Metall. Mater. Trans. A 43 360
[9] Yan N, Wang W L, Dai F P, Wei B B 2011 Acta Phys. Sin. 60 036402 (in Chinese)[闫娜, 王伟丽, 代富平, 魏炳波 2011 60 036402]
[10] Ruan Y, Lu X Y 2012 J. Alloys Compd. 542 232
[11] Pan X H, Hong Y, Jin W Q 2005 Chin. Phys. Lett. 11 2966
[12] Yi X H, Liu R S, Tian Z A, Hou Z Y, Wang X, Zhou Q Y 2006 Acta Phys. Sin. 55 5386 (in Chinese) [易学华, 刘让苏, 田泽安, 侯兆阳, 王鑫, 周群益 2006 55 5386]
[13] Pan X H, Jin W Q, Liu Y, Ai F 2009 Chin. Phys. B 18 699
[14] Qu M, Liu L, Zhao M 2010 International Conference on Advances in Materials and Manufacturing Processes ShenZhen, Peoples R China, November 6-8, 2010 p729
[15] Xu R, Zhao H, Li J, Liu R, Wang W K 2006 Mater. Lett. 60 783
[16] Anusionwu B C, Adebayo G A, Madu C A 2009 Appl. Phys. A 97 533
[17] Kanibolotsky D S, Bieloborodova O V, Kotova N V, Lisnyak V V 2002 J. Therm. Anal. Calorim. 70 975
[18] Zhou X 2011 Trans. Nonferrous Met. Soc. China 21 1513 (in Chinese) [周娴 2011 中国有色金属学报 21 1513]
[19] Zhang X L, He D Y, Li X Y, Jiang J M 2009 Mater. Sci. Technol. 17 65 (in Chinese) [张晓丽, 贺定勇, 李晓延, 蒋建敏 2009 材料科学与工艺 17 65]
[20] Stadnik Z M, Stroink G 1991 Phys. Rev. B 43 894
[21] Kanibolotsky D S, Kotova N V, Bieloborodova O A, Lisnyak V V 2003 J. Chem. Therm. 35 1763
[22] Villars P, Prince A, Okamoto H 1997 Ternary Alloy Phase Diagrams (2nd Ed.) (New York: ASM International) p3216
[23] Brandes E A, Brook G B 1992 Smithells Metals Reference Book (7th Ed.) (Great Britain: Bath) pp8-41
[24] Lee E, Ahn S 1994 Acta Metall. Mater. 42 3231
[25] Dragnevski K, Cochrane R F, Mullis A M 2002 Phys. Rev. Lett. 89 215502
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