Deformation Behavior of SiC/2014 Al Metal-Matrix Composite.

摘要

The deformation behavior of a composite composed of 25-volume-percent silicon carbide (SiC) whiskers in 2014 aluminum matrix was studied. Specimens were taken from a hot isostatically pressed cylindrical billet, then tested at various loading conditions and strain rates. Mechanical deformation of the composite was performed using tension, compression, torsion, Bauschinger effect, and fracture toughness testing. Deformation of the composite under shock loading/unloading and spallation threshold were determined. Elastic wave velocities at high pressures to 1.5 GPa and volume compression to 4.5 GPa were measured to determine the pressure dependence of elastic constants and isothermal and adiabatic equations of state. Keywords: Elastic constants; High temperature; Spallation; Metal-matrix composites; Strain rate; Fracture toughness; Shock loading; Equation of state; Deformation; Baushinger effect; Composite materials. (JES)