本文采用喷射成形和沉积坯热轧的方法成功制备了AZ91合金，测试了合金的力学性能，分析了合金的强化机理。实验结果表明：喷射成形的镁合金坯晶粒细小，组织均匀，第二相化合物Mg17Al12数量较少，表现出良好的塑性变形能力，道次变形量在20%左右，两次退火间的总变形量可以达到50%。经80%热轧变形后，合金完全致密化。变形使合金晶粒细化，力学性能显著提高。合金轧制后基体中仍保持很高的固溶度，经T5处理后，合金性能进一步提高。
AZ91 alloy has been successfully prepared by spray forming. The effect of the thermo-mechanical treatments on the microstructure and mechanical properties of the alloy was studied and the strengthening mechanism was analyzed. The results show that the spray-formed AZ91 alloy has, compared with the as-cast ingot, a finer microstructure with less intermetallic phase Mg17Al12 dispersed in the matrix, and, therefore, shows excellent workability. It can be hot-rolled with nearly 20% reduction for one pass. The spray-formed alloy exhibits outstanding mechanical properties after proper thermo-mechanical treatments.
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