Thermodynamic analysis of the formation of In-situ reinforced phases in cast Al-4.5Cu alloy

Abstract

The thermodynamic analysis of the formation of in-situ reinforced phases in (TiB₂+Al₃Ti)/Al-4.5Cu composites prepared by mixed salts reaction was conducted, and heat changes of mixed salts system were analyzed by differential thermal analysis(DTA).The results show that although TiB₂ possesses the strongest formation ability in Al-Ti-B ternary system, [Ti] is relatively excessive in the in-situ reaction and it combines with Al to form Al₃Ti phase. The reinforced phases are TiB₂ and Al₃Ti in the produced composites due to the reaction taking place to form reinforced phase with the addition of mixed salts into Al-4.5Cu melt between 900 °C and 1 032 °C.

Keywords

in-situ composites / thermodynamic, TiB₂ / Al₃Ti

References

[1] Tjong S. C., Ma Z. Y. Microstructural and Mechanical Characteristics of in situ Metal Matrix Composites[J]. Material Science and Engineering, 2000, 29: 64-66.

[2] Chen Z.-y., Chen Y.-y., Shu q., . Microstructure and Properties of as-cast Al-4.5Cu/TiB₂ Composite[J]. Composites, 2000, 17(1): 76-80.

[3] Chen z.-y., Chen y.-y., Shu q., . The fabrication of TiB₂/Al-4.5Cu Composites by Mixed Salts Reaction[J]. Special Casting & Nonferrous Alloys, 1997, 18(6): 1-5.

[4] Yuan g.-jiang. The Microstructure and Mechanical Properties of ZL201/TiB2p by XD Method[D], 1997. Ha’erbin: Ha’erbin Industry University.

[5] Wang d.-q., Ludo F. In-situ Synthesis of Particlereinforced Aluminium Matrix Composites by Differential Scanning Calorimetry[J]. Journal of Dalian Railway Insitute, 2000, 21(2): 71-77.

[6] Yin S., Liu Y., Lai H. Thermodynamic Analysis of Combustion Synthesis of Alumina/boride Composite[J]. Key Engineering Materials, 2002, 217: 9-12.

[7] Fan T.-x., Yang G., Zhang D. Thermodynamic Effect of Alloying Addition on in-situ Reinforced TiB₂/Al Composites[J]. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 2005, 36(1): 225-233.

[8] Liang Y.-j., Che Y.-chang. Handbook of Thermodynamic Data for Inorganic Compound[M], 1996. Shenyang: Northeastern university Press.

[9] Ma Z.-y., Lv Y.-x., Bi J. Fabrication and Properties of in-situ Al₂O₃ and TiB₂ Particles Reinforced Al-Cu Alloy Composites[J]. The Chinese Journal of Nonferrous Metals, 1999, 9(1): 101-105.

[10] Liu H.-w., Chen K.-hua. The Refining Effect of in-situ TiB₂ and Al₃Ti on ZL201[J]. Special Casting & Nonferrous Alloys, 2000, 21(2): 37-40.

[11] Yue N. L., Lu L., Lai M. O. Application of Thermodynamic Calculation in the in-situ Process of Al/TiB₂[J]. Composite Structures, 1999, 47(1): 691-694.