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为了提高铝合金铸锭的形变能力,在均匀化处理后、挤压之前应进行析出退火处理。析出退火的最佳温度是合金中基本合金组元固溶稳定性最小的温度,可保证在最短的保温时间内最快地提高铸锭的变形能力(金属流动速度)。采用连续铸造法生产直径为134毫米的标准成分的B95合金锭。车皮后锯成φ125×250毫米的毛料和试片,均在460℃均匀化处理12小时,以250℃/时的速度冷却到析出退火温度。在250～450℃内3小时温度波动不超过25℃的情况下进行析出退火,而后毛料和试片于空气中冷却。
In order to improve the deformation ability of aluminum alloy ingot, after homogenization treatment, extrusion annealing should be carried out before precipitation. The optimum temperature for precipitation and annealing is the temperature at which the basic alloy components in the alloy form have the lowest solid solution stability, ensuring that the deformation capacity (metal flow rate) of the ingot is maximized within the shortest holding time. B95 alloy ingots of standard composition with a diameter of 134 mm were produced by continuous casting. After the wagon was sawed into φ125 × 250 mm of wool and test pieces were homogenized at 460 ℃ for 12 hours to 250 ℃ / hour cooling rate to precipitation annealing temperature. Precipitation annealing was performed at a temperature of 250-450 ° C for 3 hours without fluctuating more than 25 ° C, and then the wool and the test piece were cooled in the air.