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3 results on '"Reaction synthesis"'

1. Characteristics of Nano-alumina Particles Dispersion Strengthened Copper Fabricated by Reaction Synthesis.

Author

Zhang, Xuehui, Lin, Chenguang, Cui, Shun, and Li, Zengde

Abstract

Alumina dispersion strengthened copper (ADSC) composite was prepared by reaction synthesis (RS) process. Results show that nano-sized γ -Al 2 O 3 particles with about 10 nm in size are homogeneously distributed in copper matrix. A coherent interface relationship with (002) Cu // (133) γ -Al 2 O 3 , and [110] Cu //[011] γ -Al 2 O 3 characterizes along the explored interfaces of the composites. All of the interfaces are clear and closely combined with each other. The composites have high properties, the tensile strength can reach 570 MPa and the yield strength can reach 533 MPa at room temperature. Meanwhile, the softening temperature is higher than 1173 K. The electrical conductivity of the sample is 85% IACS and the Rockwell hardness can reach 86 HRB. [ABSTRACT FROM AUTHOR]

Published
2016
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2. Microstructure Evolution of in situ (Ti3AlC + Ti5Si3)/Ti3Al Composite Sheet with a Novel Quasi-continuous Chain Reinforcement Distribution Architecture Prepared by Using Roll Bonding and Reaction Annealing.

Author

Pang, J.C., Fan, G.H., Cui, X.P., Li, A.B., Geng, L., Zheng, Z.Z., and Wang, Q.W.

Subjects
MICROSTRUCTURE, TITANIUM compounds, COMPOSITE materials, ANNEALING of metals, KIRKENDALL effect, SILICON carbide
Abstract

The Ti3Al matrix composite sheet with a novel quasi-continuous chain reinforcement distribution was prepared by using roll bonding and subsequent reaction annealing with pure Ti and SiCp/Al foils. The (Ti3AlC + Ti5Si3) reinforcements were produced by in situ reaction of the as-rolled Ti–(SiCp/Al) laminated composite sheet after a two-stage annealing treatment including first annealing at 660 °C and second annealing at 1250 °C. The microstructure evolution during the reaction annealing was investigated. In the first reaction annealing, TiAl3 was formed, and the SiC particles were pushed together due to the Kirkendall effect, and after the second reaction annealing, Ti3Al, Ti3AlC and Ti5Si3 were synthesized. In addition, the reinforcement distribution presents a quasi-continuous chain microstructure in Ti3Al matrix composite sheet. [ABSTRACT FROM AUTHOR]

Published
2013
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3. Effect of Pressure and Temperature on Phase Transformation and Properties of Titanium Aluminide Obtained through Reaction Synthesis.

Author

Gupta, R.K., Pant, Bhanu, Agarwala, Vijaya, Agarwala, R.C., and Sinha, P.P.

Subjects
TITANIUM group, POWDERS, TEMPERATURE, BALL mills, PRESSURE, MECHANICAL behavior of materials
Abstract

Reaction synthesis process has been used to develop γ titanium aluminide using elemental powders. Powder mixture of Ti-48 at. pct Al was prepared in ball mill and reaction synthesis was carried out in hot press with varying temperature and pressure. Titanium aluminide synthesized under high pressure and temperature resulted in better properties with respect to densification, homogenization response, mechanical properties and oxidation resistance as compared to that synthesized under low pressure and temperature. Al rich phases were observed in as-synthesized condition in all the experiments. However, some Ti rich phases were also found in high pressure-temperature synthesized samples. Density, hardness and tensile strength have been correlated with applied pressure through empirical relations. Variation in density with pressure is found to be logarithmic whereas hardness and tensile strength variation with pressure is polynomial. [Copyright &y& Elsevier]

Published
2010
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