喷射沉积AZ31镁合金微观组织与力学性能

采用喷射沉积方法制备了AZ31镁合金沉积柱坯,利用热轧作为后续加工,研究了镁合金的组织变化及材料的性能.实验结果表明:沉积态合金组织均匀,晶粒细小(平均晶粒尺寸约为20μm);热轧变形的致密化过程、动态再结晶以及退火再结晶使合金具有良好的组织结构和力学性能;轧制态试样断口呈现为脆性解理断裂方式,退火态试样断口则表现为脆性和韧性断裂混合机制.

Microstructure and mechanical properties of spray formed AZ31 magnesium alloy

AZ31 magnesium alloy billets were prepared by spray forming technique, then the alloy billets were hot rolled into compact plates. The microstructure and mechanical properties of the alloy were investigated. The result indicates that the spray formed alloy has a fine microstructure with an average grain size of 20 μm. The finer and mechanical properties were gained by the compacted processing, dynamic recrystallization and annealed static recrystallization. The fracture surfaces of the as-hot rolled sample show a typical brittle fracture character while the as-annealed sample displays a mixed mode of brittle fracture and tough-hess fracture.