论文标题
Al-MG-SI合金中人工衰老的微观方面
Microscopic aspects of artificial ageing in Al-Mg-Si alloys
论文作者
论文摘要
将溶质，淬火，然后在180°C下人为老化（AA）的Al-MG-SI合金溶质，淬火，然后在180°C下进行溶液，然后将其进行positron Ennihilation Lifetime Spectroscopicy进行溶液，淬火，然后进行人工老化（AA），以获取有关先例衰变期间的降水和空位演化的信息。进行硬度和电阻率测量以补充这些测量值。 AA是在四种不同的加热介质中进行的，从而使加热速率从2.4 k/s到170 k/s。该研究的主要结果是空位损失与降水之间存在竞争。在淬火期间或加热到AA温度时发生的任何降水都有助于防止空位进入下沉，并使他们可以协助溶质聚类。较高的溶质含量，较慢的加热至180°C，并且在AA之前的自然预期具有可比的作用。
Al-Mg-Si alloys with total solute contents ranging from 0.8 to 1.4 wt.% were solutionised, quenched and then artificially aged (AA) at 180 °C, after which positron annihilation lifetime spectroscopy was applied to obtain information about precipitation and vacancy evolution during preceding ageing. Hardness and electrical resistivity measurements were carried out to complement these measurements. AA was carried out in four different heating media, which allowed for varying the heating rate from 2.4 K/s to 170 K/s. The main result of the study is that there is a competition between vacancy losses and precipitation. Any precipitation taking place during quenching or during heating to the AA temperature helps to prevent vacancies from going to sinks and allows them to assist in solute clustering. Higher solute content, slower heating to 180 °C and natural pre-ageing before AA were found to have a comparable effect.
