Densification process of 10%B_4C-AA2024 matrix composite strips by semi-solid powder rolling

半固态粉末轧制法制备10%B_4C-AA2024复合材料带材的致密化过程（英文）

Semi-solid powder rolling（SSPR） is a novel strip manufacturing process,which includes the features of semi-solid rolling and powder rolling.In this work,densification process and deformation mechanisms of B4 C and AA2024 mixed powders in the presence of liquid phase were investigated.The relationships between relative densities and rolling forces were analyzed as well.The results show that liquid fraction plays an important role in the densification process which can be divided into three stages.Rolling deformation is the main densification mechanism in deformation area when the liquid fraction is lower than 20%.When the liquid fraction is equal to or higher than 20%,the flowing and filling of liquid phase are the densification mechanisms in deformation area.The relative densities increase with increasing rolling forces.The relative density–rolling force curves are similar at 550 °C and 585 °C.The characteristics of the curve shapes are apparently different at 605 °C and 625 °C.

半固态粉末轧制法是一种制备带材的新型工艺方法,既包含有粉末轧制技术的优点,也包含有半固态轧制技术的优点。研究B4C与AA2024混合粉末颗粒在存在液相情况下的致密化过程和变形规律,同时分析相对密度与轧制力的关系。结果表明,液相分数对半固态粉末轧制带材的致密化过程有着重要的影响。致密化过程可分为3个阶段。当液相分数低于20%时,轧制变形成为主要的致密机制;当液相分数高于20%时,液相的流动与填充成为带材的致密机制。随着轧制力的增加,材料相对密度增大。在550°C和585°C条件下得到的相对密度与轧制力曲线变化趋势相一致。而605°C和625°C得到的相对密度与轧制力曲线趋势明显不一致。