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Effect of Be on Aging Behavior of an Al-Si-Cu-Mg Cast Alloy

机译：铍对Al-Si-Cu-Mg铸造合金时效行为的影响

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摘要

The effect of Be addition on the aging behavior of UNS 03370 (Al11Si3Cu0.3Mg) was investigated by micro-hardness measurement, differential scanning calorimetry (DSC) and transmission electron microscope (TEM) analysis. Age hardening analysis shows Be additions to an Al11Si3Cu0.3Mg alloy accelerates the age hardening rate and increases the peak hardness by 15 HV during aging at 160 deg C. DSC shows that Be additions lead to an endothermic peak corresponding to the dissolution of Gunier Preston zones (GP I) disappear with exothermic peaks corresponding to precipitation of GP II zones and the lambda' and/or theta' phases shift to low temperature. DSC and TEM analyses show that GP II zones are more effective than lambda' and/or theta' on hardening the alloy, and Be addition increases the homogeneous nucleation density of GP II zones. The possible Be atoms participating in the precipitation process during aging and the high Be-vacancy binding energy can explain the effect of Be on aging behavior of Al11Si3Cu0.3Mg alloy.
机译：通过显微硬度测量，差示扫描量热法（DSC）和透射电子显微镜（TEM）分析研究了Be对UNS 03370（Al11Si3Cu0.3Mg）的老化行为的影响。时效硬化分析表明，向Al11Si3Cu0.3Mg合金中添加Be可以加速时效硬化速度，并在160℃时效时将峰值硬度提高15HV。DSC表明，Be的添加导致吸热峰对应于Gunier Preston区的溶解（GP I）消失，放热峰对应于GP II区的沉淀，λ′和/或θ′相转移到低温。 DSC和TEM分析表明，GP II区在硬化合金方面比lambda'和/或theta'更有效，并且Be添加会增加GP II区的均匀成核密度。在时效过程中可能的Be原子参与了析出过程以及高的Be空位结合能可以解释Be对Al11Si3Cu0.3Mg合金时效行为的影响。

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