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为获得可提高Al-Cu-Li合金强度和塑性的加工工艺,比较如下两种工艺:固溶后的合金板材分别在低温(液氮温度)及室温下轧制变形(变形量达83%),随后在160°C下进行人工时效。结果表明,在低温冷轧+时效工艺条件下得到的Al-Cu-Li合金具有更优的力学性能。在低温冷轧后由于动态回复的抑制会产生大量位错,这将促进T_1相(Al_2CuLi)在时效过程中的析出。时效过程析出的高密度T_1相可有效钉扎位错,从而使合金的强度及塑性提高;相反,室温轧制+时效工艺得到的合金强度及塑性较低,这是由于低密度的T_1相在晶内析出,而高密度的T_1相在亚晶界处析出。
In order to obtain the processing technology that can improve the strength and ductility of Al-Cu-Li alloy, the following two processes are compared: the solution-treated alloy sheet is deformed by deformation at a low temperature (liquid nitrogen temperature) and room temperature (deformation amount is 83% , Followed by artificial aging at 160 ° C. The results show that the Al-Cu-Li alloy obtained under cold-rolling + aging conditions has better mechanical properties. A large number of dislocations are generated due to the inhibition of dynamic recovery after cold rolling, which will promote the precipitation of T 1 phase (Al 2 CuLi) during aging. The high-density T_1 phase precipitated during the aging process can effectively pin dislocation, thereby increasing the strength and ductility of the alloy; on the contrary, the strength and ductility of the alloy obtained by the room-temperature rolling + aging process is low due to the low density T_1 phase Crystallization, and high-density T_1 phase precipitation in the subgrain.