This study investigated the critical high-temperature deformation of the low-lead (Pb) Cu38Zn3Pb alloy. Moreover, the dezincification mechanism of this alloy for high-temperature applications was evaluated. The results reveal that tensile temperatures influence the phase structures of the brass alloy matrix. Many voids and holes formed at the phase boundaries above 400 °C due to the hard-brittle b’ phase which transformed into the softer b phase, thus causing low-strength and high-ductility values. High strain rate deformation promotes more obvious intermediate-temperature brittleness in the brass alloy. The Cu38Zn3Pb alloys display the lowest impact toughness between 400 °C and 600 °C. Long-term hot working caused dezincification in the brass alloy, thus deteriorating its ductility. The influences of thermal dezincification on the mechanical properties of the alloy must be considered during processing or heat treatment.

中文翻译：

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低铅黄铜合金临界高温变形的新应用研究

本研究调查了低铅（Pb）Cu38Zn3Pb合金的临界高温变形。另外，评价了该合金在高温下的脱锌机理。结果表明，拉伸温度影响黄铜合金基体的相结构。由于脆性b'相转变为较软的b相，在高于400°C的相界处形成许多空隙和孔洞，从而导致强度低和延展性高。高应变率变形促进黄铜合金的中温脆性更明显。Cu38Zn3Pb合金在400°C至600°C之间表现出最低的冲击韧性。长期的热加工会导致黄铜合金中的脱锌，从而降低其延展性。