用光学显微镜和扫描电镜对尺寸为Φ6 mm的加工态Ir和IrRh40合金棒材的金相组织、高温氧化后的组织和 IrRh40/GH3128合金焊缝进行了研究；采用力学试验机对 IrRh40/GH3128的焊接强度进行了研究。结果表明，Rh的加入在Ir中能起到了明显的细化晶粒作用，显著提高了Ir的抗氧化性能；IrRh40与GH3128合金的焊接性能良好，焊缝强度可达到474 MPa。
Microstructure of processing state, microstructure after high temperature oxidation of Ir and IrRh40 alloy bar with 6 mm were investigated by means of optical microscope (OM), scanning electron microscope (SEM); the weld fracture and welding strength of IrRh40/GH3128 alloy were studied by OM, SEM and tensile testing machine. The results indicate that addition of Rh play a significant role in refining the grain size of Ir. The oxidation resistance of Ir is improved by addition of Rh .The welding performance of IrRh40 and GH3128 alloy is good. Tension strength of the weld line can reach 474 MPa.
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