Microscopic Evaluation of Elastoplastic Deformation Behavior of Sintered Tungsten Alloys

概要

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The objective of this study is to achieve a detailed understanding of 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 nuiaxialcompression 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 that 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 untillarge deformation.
2000-07-15