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Investigation on Microstructure and Fracture Mechanism of Iridium Sheet at Room Temperature
Pages: 42-48
Year: Issue:  3
Journal: Precious Metals

Keyword:  metal materialsIr sheettensile testing at room temperaturefracture morphologyinherent brittleness;
Abstract: Impurity contents, microstructures, fracture surfaces and mechanical properties of iridium (Ir) sheets under different processing conditions were investigated by means of glow discharge mass spectrometry (GDMS), optical microscope (OM), scanning electron microscope (SEM) and tensile testing machine. The results indicate that processing condition has great effect on mechanical properties of Ir sheet. The ultimate tensile strength and elongations of 1mm hot rolled Ir sheet were 213.6 MPa and 2.52%, respectively, with a mixture fracture mode ofbrittle intergranular fracture and brittle transgranular cleavage fracture.The ultimate tensile strength and elongations of0.1 mm cold worked Ir sheet were 954.1 MPa and 0.55%, respectively, with mainly transgranular brittle fracture. No obviously evidence of plastic deformation was occurred before tensile failure.
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