بررسی جدایش میکروسکوپی آلیاژهای آلومینیوم- مس بوسیله آنالیز حرارتی و مدل‌سازی عددی

مهندسی متالورژی و مواد

مقاله 6، دوره 28، شماره 1 - شماره پیاپی 15، اسفند 1395، صفحه 51-72   

نوع مقاله: علمی و پژوهشی

شناسه دیجیتال (DOI): 10.22067/ma.v28i1.33513

نویسندگان

محمد حسن عوض‌کننده قراول¹؛ محسن حداد سبزوار^{* 2}

¹دانشکده مهندسی، دانشگاه حکیم سبزواری، سبزوار

²دانشگاه فردوسی مشهد

چکیده

در این تحقیق جدایش میکروسکوپی در آلیاژهای دوتایی آلومینیوم- مس حاوی 2/2، 7/3 و 8/4 درصد وزنی مس با استفاده از آنالیز حرارتی تفاضلی و مدل‌سازی عددی بررسی شد. آلیاژهای مورد نظر با استفاده از یک کوره آنالیز حرارتی تفاضلی با قابلیت کوینچ نمونه‌ها ذوب و با سرعت‌های 008/0 و 083/0 درجه بر ثانیه منجمد و از دماهای معینی در حین انجماد کوینچ شدند. شکل‌گیری ریزساختار و جدایش میکروسکوپی با در نظر گرفتن و بدون در نظر گرفتن تهی‌جاهای اضافی به صورت عددی مدل‌سازی شد و مشخص گردید که در نظر گرفتن تهی‌جاهای اضافی در مدل‌سازی منجر به توافق بهتر نتایج مدل‌سازی با نتایج تجربی می‌شود.

کلیدواژه‌ها

آلیاژهای آلومینیوم- مس، جدایش میکروسکوپی؛ آنالیز حرارتی؛ تهی‌جاهای اضافی

مراجع

1. Kraft T., Rettenmayr M., Exner H.E., “An Extended Numerical Procedure for Predicting Microstructure and Microsegregation of Multicomponent Alloys”, Modelling and Simulation in Materials Science and Engineering, Vol. 4, pp. 161–177, (1996).

2. Voller V.R., “A Semi-Analytical Model of Microsegregation and Coarsening in a Binary Alloy”, Journal of Crystal Growth, Vol. 197, pp. 333340, (1999).

3. Shin Y.H., Kim M.S., Oh K.S., Yoon E.P., Hong C.P., “An Analytical Model of Microsegregation in Alloy Solidification”, ISIJ International, Vol. 41, pp. 158–163, (2001).

4. Dong H.B., “Numerical Modelling and Experimental Investigation of Microsegregation in Al-4.45 wt pct Cu: Effect of Dendrite Joining”, Journal of Materials Science and Technology, Vol. 21, pp. 753758, (2005).

5. Du Q., Eskin D.G., Jacot A., Katgerman L., “Two-Dimensional Modelling and Experimental Study on Microsegregation During Solidification of an Al–Cu Binary Alloy”, Acta Materialia, Vol. 55, pp. 1523–1532, (2007).

6. Kasperovich G., Volkmann T., Ratke L., Herlach D., “Microsegregation During Solidification of an Al-Cu Binary Alloy at Largely Different Cooling Rates (0.01 to 20,000 K/s): Modeling and Experimental Study”, Metallurgical and Materials Transactions A, Vol. 39, pp. 11831191, (2008).

7. Battle T.P., “Mathematical Modelling of Solute Segregation in Solidifying Materials”, International Materials Reviews, Vol. 37, pp. 249270, (1992).

8. Glicksman M.E., Hills R.N.,” Non-Equilibrium Segregation During Alloy Solidification”, Philosophical Magazine A, Vol. 81, pp. 153159, (2001).

9. Yan X., Xie F., Chu M., Chang, Y.A., “Microsegregation in Al–4.5Cu wt.% Alloy: Experimental Investigation and Numerical Modeling”, Materials Science and Engineering A, Vol. 302, pp. 268–274, (2001).

10. Liang H., Kraft T., Chang Y.A., “Importance of Reliable Phase Equilibria in Studying Microsegregation in Alloys: Al–Cu–Mg”, Materials Science and Engineering A, Vol. 292, pp. 96–103, (2000).

11. Kurum E.C., Dong H.B., Hunt J.D., “Microsegregation in Al-Cu Alloys”, Metallurgical and Materials Transactions A, Vol. 36, pp. 31033110, (2005).

12. Mortensen A., “On the influence of coarsening on microsegregation”, Metallurgical Transactions A, Vol. 20, pp. 247253, (1989).

13. Fredriksson H., Arai Y., Emi T., Haddad-Sabzevar M., Shibata H., “Melting Temperature, Transformation and Metastable Phase Diagram of Rapidly Solidified Ag-Cu Alloys”, Materials Transactions JIM, Vol. 39, pp. 587595, (1998).

14. Fredriksson H., Haddad-Sabzevar M., Hansson K., Kron J., “Theory of Hot Crack Formation”, Materials Science and Technology, Vol. 21, pp. 521529, (2005).

15. Mahmoudi J., Fredriksson H., “Modelling of Solidification for Copper-Base Alloys During Rapid Solidification Processing”, Materials Science and Engineering A, Vol. 226-228, pp. 2227, (1997).

16. Mahmoudi J., Fredriksson H., “Thermal Analysis of Copper-tin Alloys During Rapid Solidification”, Journal of Materials Science, Vol. 35, pp. 4977–4987, (2000).

17. Fjellstedt J., Fredriksson H., “An Experimental and Theoretical Study of the Microsegregation in Al-6% Cu and Al-2% Si Alloys”, Proceeding of the international conference on solidification science and processing: outlook for the 21st century, Bangalore, India, (2001).

18. Fjellstedt J., Fredriksson H., “On the crystallization process of hypoeutectic Al-6% Cu, unmodified and Sr-modified Al-2% Si solidified alloys”, Advanced Engineering Materials, Vol. 5, pp. 2432, (2003).

19. Fredriksson H., Jacobson N., “The effect of interface kinetics on crystallization processes of alloys at high cooling rate”, Key Engineering Materials, Vol. 871-83, pp. 5970, (1993).

20. Gungor M.N., “A statistically significant experimental technique for investigating microsegregation in cast alloys”, Metallurgical Transactions A, Vol. 20, pp. 25292533, (1989).

21. Dinsdale A.T., SGTE data for pure elements, Calphad, Vol. 15, pp. 317425, (1991).

22. Wollenberger H.J., Point Defects, in: “Physical Metallurgy”, 4th ed., Vol. 2, R.W. Cahn and P. Hanssen (eds.), Elsevier Science B.V., Netherland, p. 1629, (1996).

23. Gale W.F., Totemeier T.C., “Smithells Metals Reference Book”, 8th edition, Elsevier Butterworth-Heinemann Publications, USA, (2004).

24. Sundarraj S., Voller V.R., “The binary alloy problem in an expanding domain: the microsegregation problem”, International Journal of Heat and Mass Transfer, Vol. 36, pp. 713723, (1993).

25. Tanzilli R.A., Heckel R.W., “Numerical solutions to the finite, diffusion-controlled, two-phase, moving-interface problem (with planar, cylindrical, and spherical interfaces)”, Transactions of the Metallurgical Society of AIME, Vol. 242, pp. 2312–2321, (1968).

26. Lee J.-H., Liu S., Miyahara H., Trivedi R., “Diffusion-coefficient measurements in liquid metallic alloys”, Metallurgical and Materials Transactions B, Vol. 35, pp. 909917, (2004).

27. Du Y., Chang Y.A., Huang B., Gong W., Jin Z., Xu H., Yuan Z., Liu Y., He Y., Xie F.-Y, “Diffusion coefficients of some solutes in FCC and liquid Al: critical evaluation and correlation”, Materials Science and Engineering A, Vol. 363, pp. 140151, (2003).

28. Chen S.W., Huang C.C., “Solidification curves of Al-Cu, Al-Mg and Al-Cu-Mg alloys”, Acta Materialia, Vol. 44, pp. 1955-1965, (1996).

29. Korojy B., Ekbom L., and Fredriksson, H., “Microsegregation and Solidification Shrinkage of Copper-Lead Base Alloys”, Advances in Materials Science and Engineering, Vol. 2009, pp. 1-9, (2009).

30. Fredriksson H., Akerlind U., “Solidification and crystallization processing in metals and alloys”, John Wiley & Sons Ltd. publication, UK, pp. 475-586, (2012).

31. Roosz A., Halder E., Exner H.E., “Numerical calculation of microsegregation in coarsened dendritic microstructures”, Materials Science and Technology, Vol. 2, pp. 1149-1155, (1986).

32. Kraftmakher Y., “Equilibrium vacancies and thermophysical properties of metals”, Physics Reports, Vol. 299, pp. 79-188, (1998).

33. Porter D.A., Easterling K.E., “Phase Transformation in Metals and Alloys”, Chapman & Hall, UK, pp. 60-109, (1992)

34. Nagai Y., Tang Z., Inoue K., Hasegawa M., Ohkubo H., “Vacancy-solute binding energies in aluminum by positron annihilation”, Materials Science Forum, Vol. 445, pp. 165-167, (2004).

35. Ferragut R., Dupasquier A., Macchi C.E., Somoza A., Lumleyd R.N., Polmear I.J., “Vacancy–solute interactions during multiple-step ageing of an Al–Cu–Mg–Ag alloy”, Scripta Materialia, Vol. 60, pp. 137–140, (2009).

36. Sternberg Z., Stupnisek M., “Enhanced diffusion of Cu in aluminium under low-energy ion bombardment”, Europhysics Letters, Vol. 71, pp. 757–762, (2005).

37. Gapontsev V.L., Koloskov V.M., “Nonequilibrium vacancy-stimulated diffusion (induced diffusion) as the main mechanism of activated alloy formation”, Metal Science and Heat Treatment, Vol. 49, pp. 503-513, (2007).

Girifalco L.A., Herman H., “A model for the growth of Guinier-Preston zones-the vacancy pump”, Acta Metallurgica, Vol. 13, pp. 583-590, (1965).