1994 年 43 巻 488 号 p. 533-538
Co-based alloy powders were dynamically compacted by using a cylindrical axisymmetric explosive method. The compacted powders were post-heat-treated in evacuated capsules from 3.6ksec to 32.4ksec at 973K and 1273K. The mechanical property was examined by using a bending test.
The bending strength of the as-compacted material was below 120MPa, which is about one-fifth that of the cast material. The fracture pattern of the as-compacted material exhibited interparticle fracture. The strength of the compacted material was improved by post-heat-treatments at 1273K. But the strength was below 500MPa. The fracture pattern of transparticle fracture exhibited the quasi-cleavage fracture and in the case of the interparticle fracture the dimple pattern was observed on the powder surface.