High strain rate superplasticity in magnesium matrix composites containing 15-20 vol. % AlN particulate

The high strain rate superlasticity of the magnesium matrix composites containing 15 and 20vol% AIN particles (0.72 mu m) has been obtained at the temperature of 673K. A maximum total elongation of 256% was achieved in the composites containing 15vol% AIN particles at the strain rate 4.707X10(-1) s(-1) and 673K. In the high strain rate range from 10(-2) to I s(-1), the strain rate sensitivity exponents (m-value) of the magnesium matrix composites with 15 and 20vol% AlN particles are 0.43 and 0.32, respectively.