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前言我国国防工业和社会主义经济建设的飞速发展,对精密合金的品种和数量的要求越来越多。由于铱和铑有着高的熔点、高的弹性模量和高温强度、好的高温持久强度、低的蒸气压和优良的抗化学腐蚀性能等,因此它们成为现代尖端技术和工业不可缺少的材料,广泛地应用于国防工业和国民经济建设的许多部门,需要量越来越大。在面心立方结构的金属中,铱和铑的熔点最高,弹性模量最大,室温下性很脆,并且冷加工硬化速率很高(图1),加工中容易形成裂纹,因而给加工带来较大的困难,
Preface The rapid development of China’s national defense industry and socialist economic construction requires more and more varieties and quantities of precision alloys. Due to their high melting point, high modulus of elasticity and high temperature strength, good high temperature endurance, low vapor pressure and excellent chemical resistance, iridium and rhodium are indispensable materials for modern cutting-edge technology and industry, In many sectors that are widely used in the national defense industry and in the national economy, their needs are growing. Among the face-centered cubic metals, iridium and rhodium have the highest melting point, the highest elastic modulus, very brittle at room temperature, and have a high cold work-hardening rate (Figure 1). Cracks are easily formed during the processing, Big difficulty