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添加微量镍、铁及稀土元素的HPb60-2合金,因其良好的切削性、耐磨性及高温力学性能稳定性,可作为不可热轧HPb63-3单相合金的代用材料。文中以实际应用为目的,通过高温拉力试验和金相观测研究该合金高温塑性行为,着重阐明高温β相的晶型特点,以及‘松散’堆垛体心立方晶型在高温扩散范性机构中的贡献和微量添加元素对β相高温塑性可能有的影响;运用界面能以及由界面能确定的二面角概念,讨论了铅及其夹杂物作为Griffith型缺陷,对出现于夹杂物熔点附近温度的‘中温脆性’的影响。在此基础上描述了添加微量元素的HPb60-2合金热塑性的物理图象,为拟订合理热轧温度提供了理论和试验依据。
Add a small amount of nickel, iron and rare earth elements HPb60-2 alloy, because of its good machinability, wear resistance and high temperature mechanical stability, can be used as a hot-rolled HPb63-3 single-phase alloy substitute material. In this paper, the high-temperature plastic behavior of this alloy was investigated by high-temperature tensile test and metallographic observation. The crystal features of high-temperature β-phase and the “loose” The influence of trace elements and trace elements on the high-temperature plasticity of β-phase is also discussed. Using the interface energy and the concept of dihedral angle determined by the interface, the effects of lead and its inclusions as Griffith-type defects on the temperature near the melting point of inclusions The temperature of brittleness’ influence. On this basis, the thermoplastic physical image of HPb60-2 alloy added with trace elements is described, which provides the theoretical and experimental basis for formulating reasonable hot rolling temperature.