J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (03): 423-426.

• Research Articles • Previous Articles     Next Articles

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

Gaohui Wu, Meihui Songy, Ziyang Xiu, Ning Wang and Wenshu Yang   

  • Received:2008-03-07 Revised:2008-06-22 Online:2009-05-28 Published:2009-10-10
  • Contact: Meihui Song

Abstract:

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 X-
ray 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.

Key words: Magnesium matrix composites, Microstructure, Dislocations, Twin