采用光学显微镜(OM)、扫描电镜(SEM)和力学试验机等测试手段，对Φ0.5 mm的加工态Ir丝和IrRh40合金丝的金相组织、断口形貌和力学性能进行了分析。结果表明：Rh能明显细化Ir合金的显微组织，IrRh40合金比纯Ir具有更细的晶粒，但Rh并不能提高Ir合金的强度和延伸率，Ir丝的平均抗拉强度为2103 MPa，IrRh40合金丝的平均抗拉强度为1765 MPa，2种合金的延伸率为8%~10%；Ir丝和IrRh40合金丝的拉伸断裂方式主要为穿晶断裂，在断裂之前存在明显的“颈缩”现象。
Microstructures, fracture surfaces and mechanical properties of Ir and IrRh40 thermocouple wires were investigated by means of optical microscope (OM), scanning electron microscope (SEM) and tensile testing machine. The results showed that Rh element can obviously refine the microstructure of Ir alloy; the grain structure of IrRh40 alloy was finer than that of Ir. However, the ultimate tensile strength and elongation of Ir wire were not improved by Rh, and the ultimate tensile strength of Ir and IrRh40 wires were about 2103 MPa and 1765 MPa, respectively. Elongations of two alloys were about of 8%~10%. The fracture modes of Ir and IrRh40 wires during tensile deformation are of transgranular crack, and phenomenon of necking take place before tensile failure.
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