Microstructure and Properties of M40 Carbon Fibre Reinforced Mg-Re-Zr Alloy Composites

M40 carbon fibre reinforced rare earth magnesium alloy ZM6 composites with fibre volume fraction about 60%were fabricated by pressure infiltration method.The microstructure, interfacial morphology, and precipitation were studied by scanning electron microscopy, transmission electron microscopy, and energy dispersive Xray spectrometer.It was shown that the interfaces between Mg alloy and fibres were well bonded and free from cracks.The Mg12Nd phase was preferentially precipitated at the fibre/matrix interfaces, leading to the segregation of Nd at the interfaces and the dramatic decrease of Mg12Nd precipitation in the matrix far from interfaces.Crystal defects such as high-density dislocations and twins were observed in the matrix near the fibre/matrix interface.A high bending strength (1393 MPa) and elastic modulus (190 GPa) were achieved in M40/ZM6 composite.