Based on the assumption that the nucleation substrates are activated by constitutional undercooling generated by an adjacent grain growth and solute distribution during the initial solidification, a model for calculation of the grain size of aluminum alloys with the grain refinement is developed, where the nucleation is dominated by two parameters, I.e. Growth restriction factor Q and the undercooling parameter P. The growth restriction factor Q is proportional to the initial rate of constitutional undercooling development and can be used directly as a criterion of the grain refinement in the alloys with strong potential nucleation particles. The undercooling parameter P can be regarded as the maximum of constitutional undercooling △TC. For weak potential nucleation particles, the use of RGS would be more accurate. The experimental data of the grain refinement of pure aluminum and AISi7 alloys are coincident predicted results with the model.
参考文献
| [1] | L. Sturz;A. Drevermann;C. Pickmann .Influence of grain refinement on the columnar-to-equiaxed transition in binary Al alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(0):379-383. |
| [2] | L Y Pio;S Sulaiman;A M Hamouda .[J].Journal of Materials Processing Technology,2005,162-163:435. |
| [3] | Yijie ZhangT;Naiheng Ma;Yongkang Le;Songchun Li Haowei Wang .[J].Materials Letters,2005,59:2174. |
| [4] | M.Easton;D.Stjohn .Grain refinement of aluminum alloys: Part I.The nucleant and solute paradigms—A review of the literature[J].Metallurgical and materials transactions. A, physical metallurgy and materials science,1999(6):1613-1623. |
| [5] | I Maxwell;A Hellawell .[J].Acta Metalluraica,1975,23:229. |
| [6] | M. A. EASTON;D. H. STJOHN .A MODEL OF GRAIN REFINEMENT INCORPORATING ALLOY CONSTITUTION AND POTENCY OF HETEROGENEOUS NUCLEANT PARTICLES[J].Acta materialia,2001(10):1867-1878. |
| [7] | F A Crossle;L F Mondolfo .[J].Journal of Metals,1951,191:1143. |
| [8] | M. Jaradeh;T. Carlberg .Effect of titanium additions on the microstructure of DC-cast aluminium alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(0):277-282. |
| [9] | N. Iqbal;N.H. van Dijk;S.E. Offerman;N. Geerlofs;M.P. Moret;L. Katgerman;G.J. Kearley .In situ investigation of the crystallization kinetics and the mechanism of grain refinement in aluminum alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):18-32. |
| [10] | P Mohanty;J Gruzleski .[J].Acta Metallurgica Et Materialia,1995,43:2001. |
| [11] | P. Schumacher;A. L. Greer;J. Worth;P. V. Evans;M. A. Kearns;P. Fisher;A. H. Green .New studies of nucleation mechanisms in aluminium alloys: implications for grain refinement practice[J].Materials Science and Technology: MST: A publication of the Institute of Metals,1998(5):394-404. |
| [12] | H. XU;L.D. XU;S.J. ZHANG .Effect of the Alloy Composition on the Grain Refinement of Aluminum Alloys[J].Scripta materialia,2006(12):2191-2196. |
| [13] | T. E. Quested;A. T. Dinsdale;A. L. Greer .Thermodynamic modelling of growth-restriction effects in aluminium alloys[J].Acta materialia,2005(5):1323-1334. |
| [14] | G Sigworth;M Guzowski .[J].AFS Transactions,1985,172:907. |
| [15] | M.Easton;D.Stjohn .Grain refinement of aluminum alloys: Part II. Confirmation of, and a mechanism for, the solute paradigm[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1999(6):1625-1633. |
| [16] | W Kurz;D J Fisher.Fundamentals of Solidification[M].Switzerland:Trans Tech Publications,1984:123-125. |
| [17] | A.L.Greer;A.M.Bunn .Modelling of Inoculation of Metallic Melts: Application to Grain Refinement of Aluminium[J].Acta materialia,2000(11):2823-2835. |
| [18] | J Spittle;S Sadli .[J].Materials Science and Technology,1995,11:533. |
| [19] | M Johnsson;L B(a)ckerud .[J].Zeitschrift fur Metallkunde,1996,87(03):216. |
| [20] | D Mccartney .[J].International Materials Reviews,1989,34:247. |
| [21] | M Guzowski;G Sigworth;D Sentner.[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1987:603. |
| [22] | M. A. Easton;D. H. StJohn .The effect of grain refinement on the formation of casting defects in alloy 356 castings[J].International Journal Cast Metals Research,2000(6):393-408. |
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