Abstract
With different high pressure heat treatments on CuAl alloy, the effects on microstructure and thermal expansion coefficients of CuAl alloy are studied in the paper by optical microscopy, scanning electron microscopy, transmission electron microscopy and expansion instrument etc. The experimental results show that after heat treatment, the structure of CuAl alloy was refined obviously and the compactness increased. The grain refinement effect increases at first and then decreases when pressure is increased. When the pressure is 3GPa, the most obvious is the thinning grain effect. In addition, the high pressure heat treatment can increase CuAl alloy thermal coefficient of expansion, when the CuAl alloy is treated by 3GPa pressure and is at 596.37°C. Thermal expansion coefficient is the biggest, 3.1187 © 1015°C11, than that of the same temperature cast state samples increase 99.34%. [doi:10.2320/matertrans.M2012358]
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