论文部分内容阅读
采用原位电阻率测试和透射电镜观察研究Al-0.96Mg2Si合金的析出行为及其对电阻率的影响。发现峰值时效的析出相包括β″和β′,而他们的比例随着时效温度和时间的改变而变化。合金在175°C峰值时效内的析出相主要是针状β″相(也包括pre-β″)。这些析出相会随着时效时间的延长而长大,但是进一步延长时效时间至超出峰值时效时间后,析出相的尺寸变化并不显著。合金电导率的变化规律与之类似。合金硬度峰值时效后,继续时效很长一段时间硬度变化都不显著。由于温度是影响β″/β′比的主要因素,因此时效温度也是影响电阻率的主要因素。时效温度越高β″/β′的比值越小,ρ下降的速度就越快。硬度也随着该比值的减小而降低。通过对透射电镜照片分析获得析出相的分布参数,建立了析出相与电阻率之间的半定量关系式。
In-situ resistivity and transmission electron microscopy were used to investigate the precipitation behavior of Al-0.96Mg2Si alloy and its effect on resistivity. The precipitated phases of peak aging were found to include β “and β ’, and their proportions varied with the aging temperature and time. The precipitation phase of the alloy at 175 ° C peak aging was mainly acicular β” phase (also pre -β ") .These precipitates will grow with the aging time, but the size of the precipitates will not change significantly when the aging time is beyond the peak aging time.The conductivity of the alloys changes in a similar way. After aging, the hardness does not change significantly after prolonged aging.As temperature is the main factor affecting the β / β ratio, the aging temperature is also the main factor affecting the resistivity. The higher the aging temperature is, the smaller the ratio of β / β is, the faster p decreases, and the hardness decreases with the decrease of the ratio.By analyzing the distribution parameters of the precipitated phase by transmission electron microscopy, Semi-quantitative relationship between phase and resistivity.