论文部分内容阅读
利用分级淬火的方法测定了1933铝合金锻件硬度及电导率的时间—温度—性能(time-temperature-property,TTP)曲线。结果表明,TTP曲线呈“C”形,淬火敏感区间为265～355℃(200 s内硬度值下降10%),TTP曲线的“鼻尖”温度大约在310℃,在此温度下,硬度下降10%的临界时间为100 s。微观组织观察表明,在敏感区间内,平衡相η在晶界及Al3 Zr与基体的界面上优先形核析出,并快速长大,导致合金过饱和度的下降,降低了时效强化的效果。与目前公布的其他Al-Zn-Mg-Cu系合金的TTP曲线对比,1933铝合金的“鼻尖”温度低,临界时间长,淬火敏感区间窄,因此淬火敏感性较低。
The time-temperature-property (TTP) curves of the hardness and electrical conductivity of 1933 aluminum alloy forgings were determined by the method of grading quenching. The results show that the TTP curve is “C” shape with the sensitivity range of 265 ~ 355 ℃ (10% decrease of the hardness value in 200 s). The temperature of the “tip” of the TTP curve is about 310 ℃. , The critical time of 10% reduction of hardness is 100 s. Microstructure observation shows that the equilibrium phase η preferentially nucleates at the grain boundary and the interface between Al3Zr and the matrix and grows rapidly in the sensitive range, resulting in the decrease of supersaturation and the effect of aging strengthening. Compared with the TTP curve of other Al-Zn-Mg-Cu alloy, the sensitivity of 1933 aluminum alloy is low because of its low temperature, long critical time and narrow quenching sensitivity range.