Microstructure evolution and mechanical properties of Mg-Gd-Y-Ag-Zr alloy fabricated by multidirectional forging and ageing treatment
发布时间：2021-10-21
点击次数：
DOI码：10.1016/j.msea.2017.06.038
发表刊物：Materials Science and Engineering A
关键字：Mg-Gd-Y-Ag-Zr alloy; Multidirectional forging; Ageing; Mechanical property
摘要：Mg-8.0Gd-3.7Y-0.3Ag-0.4Zr (wt%) bulk sample with exceptional high strength is successfully fabricated by multidirectional forging (MDF) and subsequent ageing treatment. The microstructure evolution and mechanical properties are investigated in this study. Results show that grain refining process during MDF is closely related to the dynamic recrystallization (DRX) behavior and a microstructure consisting of ultra-fine grains (~ 0.8µm) and dynamic precipitates of Mg5(GdY) is obtained when forged by 15 passes (Σ ε = 4.5). After peak-ageing treatment, densely distributed β' phase precipitates out from the matrix. Ag is mainly segregated in the dynamic precipitates. The forging-T5 sample (15 passes) exhibits a room mechanical property of 391MPa in YS, 448MPa in UTS and 3.9% in elongation to failure. The strength retains 339MPa in YS and 411MPa in UTS when tested at 200°C. The remarkable mechanical performance can be ascribed to the intensive grain refinement by MDF process, dynamic precipitates as well as precipitate strengthening by β' phase.
合写作者：C.M. Liu, Y. H. Gao*, S.N. Jiang, Z.Y. Chen, Z. Luo
第一作者：B.Z. Wang
文献类型：J
卷号：702
页面范围：22-28
ISSN号：0921-5093
是否译文：否
发表时间：2017-08-15