论文部分内容阅读
采用倒锥形通道浇注方法制备了半固态7075铝合金浆料。试验结果表明,当浇注温度为660～690℃、通道内壁锥度在2°～6°之间时,采用锥形通道浇注方法可以制备出较高品质的半固态7075铝合金浆料,且通道内挂料较少;当通道内壁锥度一定时,随着浇注温度降低,初生α-Al的平均晶粒尺寸减小、形状因子提高;当浇注温度一定时,随着通道内壁锥度的增大,初生α-Al的平均晶粒尺寸减小、形状因子提高;在倒锥形通道浇注制备半固态7075铝合金浆料过程中,通道内壁的大量形核和晶粒游离及收集坩埚中的晶粒熟化是获得细小球状初生α-Al晶粒的主要原因。
The semi-solid 7075 aluminum alloy slurry was prepared by pouring the conical channel. The results show that when the pouring temperature is between 660 ℃ and 690 ℃ and the taper of the inner wall of the channel is between 2 ° and 6 °, the semi-solid 7075 aluminum alloy slurry with high quality can be prepared by conical channel casting method, When the inner wall taper is constant, with the decrease of pouring temperature, the average grain size of primary α-Al decreases and the shape factor increases. When the pouring temperature is constant, the average grain size of α-Al decreases, and the shape factor increases. During the process of pouring the semi-solid 7075 aluminum alloy slurry into the inverted conical channel, the large number of nucleation and grain freeing in the inner wall of the channel and the grain ripening in the crucible Is to obtain a small spherical primary α-Al grains of the main reasons.