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大多数单相铜合金依温度升高而表现为塑性下降,直至出现最低值;尔后其塑性又有不同程度增长。在特定温度范围以及宽的应变速度背景出现的塑性波谷,实际应用中常称为‘中温脆性区’,并且是铜合金‘热脆’的基本原因。铜合金的高温脆性断裂是由来已久的问题。大量的工作表明,铜合金在高于熔点绝对温度之半的状态,其断裂行为更接近于扩散蠕变机制。因此这一过程常常涉及起因于晶界低熔点相偏聚或晶间空位的晶
The majority of single-phase copper alloys showed plasticity decreased with increasing temperature until the lowest value appeared, and then their plasticity increased with different degrees. Plastic troughs, which appear in a specific temperature range and a wide strain rate background, are often referred to as ’medium temperature brittle zones’ in practical applications and are the basic reason for the hot brittleness of copper alloys. Copper alloy brittle fracture of high temperature is a long standing problem. A great deal of work shows that the fracture behavior of the copper alloy is closer to the diffusion creep mechanism when the copper alloy is higher than half the absolute temperature of the melting point. This process therefore often involves crystals that originate from the low melting point phase segregation or intergranular vacancy due to the grain boundaries