【摘要】 采用喷射成形和沉积坯热轧的方法成功制备了AZ91镁合金,测试了合金的力学性能,分析了合金的强化机理．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．变形使合金晶粒进一步细化,力学性能显著提高．轧制后合金基体中仍保持很高的固溶度,经T5处理后,合金的力学性能进一步提高．更多还原

【Abstract】 Magnesium alloy AZ91 has been successfully prepared by spray forming．The effects of the thermo-mechanical treatments on the microstructure and mechanical properties of the alloy were studied and the strengthening mechanism was analyzed．The results show that,compared with the as-cast ingot,the spray-formed AZ91 alloy has a finer microstructure with less intermetallic phase Mgl7Al12 dispersed in the matrix,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．更多还原