A Theoretical Model on Solvus Line Prediction of Film and Its Application in Nanogranular Al-Cu System

A theoretical model on the solvus line prediction of a film was proposed and applied to a nanogranular Al-Cu system. The calculation results show that the solvus line of solute Cu will markedly lower with the decrease of grain size, namely, the starting temperature of θ(Al_2Cu) precipitation in a nanogranular Al-Cu film will markedly lower than that of conventional coarse grain alloy with the same Cu concentration, and the precipitation temperatures calculated are comparable with the experimental ones. The theoretical model can be simply used to calculate the starting temperature of precipitation in Al-Cu films under three states: ① films with substrate; ② films without substrate; ③ ultrafine grain bulk alloy. As a result, the model is universal, moreover, can be, in principle, used to predict precipitation temperature in other systems.     

冷轧TRIP钢的特性及应用

简介了宝钢开发的冷轧TRIP600钢板的性能和微观组织，并用TRIP600钢板冲压了国内某车型的两个零件，通过在试验室进行的性能、成形性能等分析表明，宝钢开发的TRIP600钢板兼有高的强度和成形性，在不降低其他性能的前提下，采用TRIP600钢可替代软钢冲压某些汽车结构件，且能减轻质量10%～20%。