タングステン系焼結合金の弾塑性変形挙動の微視的評価

概要

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For the purpose of investigating the macroscopic and microscopic elastoplastic deformation behavior of two-phase composites : W-Ni-Fe alloys, the constitutive relations of W-Ni-Fe alloy and its microconstituents were measured by the Hopkinson pressure bar testing and usual compression testing, and then the elastoplastic deformation behavior of W-Ni-Fe alloys in uniaxial compression was analyzed using the micromechanics-based analysis method. The main conclusions are summarized as follows ; (1) The work hardening tendency of W-Ni-Fe alloy is in keeping with that of pure tungsten particle phase which is B.C.C. metal. (2) Measured flow stresses of W-Ni-Fe alloy under high strain rate loading are smaller than analyzed ones, due to local failure in the matrix phase of W-Ni-Fe alloy. (3) The compressive residual stresses in the particle phase are produced at the cooling stage in sintering. (4) The micromechanics-based analysis method can precisely analyze the elastoplastic deformation behavior of two-phase composites until large deformation.
1999-07-25