کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5455813 | 1514641 | 2017 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure evolution and mechanical properties of Mg-Gd-Y-Ag-Zr alloy fabricated by multidirectional forging and ageing treatment
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 (~ 0.8 µm) 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 391 MPa in YS, 448 MPa in UTS and 3.9% in elongation to failure. The strength retains 339 MPa in YS and 411 MPa 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 702, 15 August 2017, Pages 22-28
Journal: Materials Science and Engineering: A - Volume 702, 15 August 2017, Pages 22-28
نویسندگان
Bizheng Wang, Chuming Liu, Yonghao Gao, Shunong Jiang, Zhiyong Chen, Zhen Luo,