Effect of thermal and mechanical processing on tensile properties of powder formed 2124 aluminium and 2124 Al-SiC p metal matrix composite

Thomas, M.P. and King, J.E. (1993). Effect of thermal and mechanical processing on tensile properties of powder formed 2124 aluminium and 2124 Al-SiC p metal matrix composite. Materials Science and Technology, 9 (9), pp. 742-753.

Abstract

The aging responses of 2124 Al-SiC p metal matrix composite (MMC) and unreinforced matrix alloy are studied and related to variations in tensile properties. The MMC is aged from Wo starting conditions: (i) stretched and naturally aged and (ii) re-solution treated. Accelerated aging occurs in both MMC conditions compared with unreinforced alloy. Tensile strengths and elastic moduli are improved in the MMC compared with the alloy, but ductility is reduced. Stretched MMC exhibits higher strength but lower ductility and modulus than re-solutioned MMC. The re-solutioned MMC fails by microvoid coalescence in low aging conditions, and by void nucleation and shear in high aging conditions. Failure of the stretched MMC initiates at the surface at specimen shoulders, illustrating the increased notch sensitivity of this condition, and propagates via a zigzag shear fracture mode. Zigzag facet size increases on gross aging. Particle fracture occurs during tensile failure, but also before testing as a result of the manufacturing process. © 1995 The Institute of Materials.

Divisions: Aston University (General)
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Uncontrolled Keywords: accelerated aging,aging conditions,aging response,manufacturing process,mechanical processing,metal matrix composites,microvoid,naturally aged,notch sensitivity,particle fracture,shear fracture,tensile failures,unreinforced alloys,unreinforced matrix,void nucleation,alloys,aluminum,coalescence,ductility,elastic moduli,fracture,fracture testing,silicon carbide,tensile strength,tensile testing,metallic matrix composites,Materials Science(all),Condensed Matter Physics,Mechanical Engineering,Mechanics of Materials
Published Date: 1993-09

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