Mg-9Gd-4Y-0.6Zr合金挤压T5态的高温组织与力学性能

Microstructures and mechanical properties of extruded Mg-9Gd-4Y-0.6Zr-T5 at elevated temperatures

研究了Mg-9Gd-4Y-0．6Zr合金挤压T5态在250-400℃之间的高温组织与力学性能。结果表明：该合金具有非常优异的高温力学性能，其力学性能明显优于WE54；该合金在250、300、350和400℃时的抗拉伸强度分别为348、262、150和62MPa；该合金在400℃拉伸时还具有粗晶超塑性，晶界上有再结晶的细晶，晶内有大量孪晶同时共存。

The microstructures and mechanical properties of the extruded Mg-9Gd-4Y-0. 6Zr-T5 at temperatures between 250 ℃ and 400℃ were investigated. The results show that this alloy has outstanding mechanical properties and high heat-resistance, and its mechanical properties are markedly better than those of WE54. The tensile strength of this alloy at 250, 300, 350 and 400 ℃ are 348, 262, 150 and 62 MPa, respectively. In tensile test at 400 ℃, the sample shows a coarse-grained superplasticity, which is not reported, and a great deal of recrystallized grains are found on grain boundaries and a lot of twins occur within the grains.