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采用末端淬火试验和OM、SEM、EDS、XRD和TEM方法研究了不同温度固溶处理对7050铝合金材料淬透层深度的影响。结果表明,影响7050铝合金淬透层深度的特征微结构因素是随淬火冷却速度降低析出的η平衡相尺寸和体积分数。475℃保温固溶(S475)试样中还存在较多的粗大Al2CuMg(S)相,490℃保温固溶(S490)试样中S相几乎全部溶入基体,淬火后能形成更高的合金原子浓度,有利于时效处理时形成数量更多、密度更大的强化相,在同等淬火条件下,S490-T6的淬透层深度比S475-T6增加约36%。
The effects of solution treatment at different temperatures on the depth of hardened layer of 7050 aluminum alloy were studied by means of end quenching test, OM, SEM, EDS, XRD and TEM. The results show that the characteristic microstructure factor affecting the depth of hardened layer of 7050 aluminum alloy is the size and volume fraction of η equilibrium phase precipitated as the quenching speed decreases. The larger Al2CuMg (S) phase still exists in the specimen of S475 at 475 ° C, and almost all of the S phase dissolves into the matrix at 490 ° C (S490), forming a higher alloy after quenching Atomic concentration is conducive to aging treatment to form a larger number of more dense phase, under the same quenching conditions, S490-T6 hardened depth than S475-T6 increased by about 36%.