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Effect of Rhenium on Microstructure and Mechanical Properties of Iridium
Pages: 1-5
Year: Issue:  3
Journal: Precious Metals

Keyword:  metal materialsIr-Re alloymicrostructuremechanical propertygrain refinement;
Abstract: Microstructures and mechanical properties of Ir with Re addition were investigated through OM, SEM and universal testing machines. The results show that the addition of Re can refine grains, and obviously improves the microstructure. With increasing of Re content, the yield strength and tensile strength of Ir-Re alloy were increased first and then decreased. With addition of 7.0% Re and under the effect of solid solution strengthening and fine grain strengthening, the yield strength and tensile strength of the alloy reach the maximum of 472.0 and 526.0 MPa. With addition of Re, the elongation of Ir-Re alloy was decreased first and then increased. The elongation of pure iridium was the highest to be 2.52%. The fracture mode of Ir-Re alloy was mixture ofbrittle intergranular fracture and brittle transgranular cleavage fracture. With addition of Re, the brittle transgranular cleavage fracturearea was increased significantly.
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