Microstructural Evolution and Properties of a Hot Extruded and HPT-Processed Resorbable Magnesium WE43 Alloy
Microstructural Evolution and Properties of a Hot Extruded and HPT-Processed Resorbable Magnesium WE43 Alloy
复制标题
热挤压和 HPT 加工可吸收镁 WE43 合金的微观结构演变和性能
DOI：
10.1002/adem.201600698
复制
发表时间：
2017
影响因子：
3.6
通讯作者：
Meyers Marc A.
中科院分区：
文献类型：
--
作者：
Liu Dexue X.;Pang Xin;Li Denglu L.;Guo Chenggong G.;Wongsa-Ngam Jittraporn;Langdon Terence G.;Meyers Marc A.
对挤压镁WE43合金轮盘进行了高压扭转加工，详细研究了其组织和力学性能的演变规律。HPT工艺实现了良好的晶粒细化，10转后，晶粒尺寸从初始的≈12 μm减小到≈200-300 nm的终值。随着HPT工艺的进行，显微硬度显著提高，但在圆盘中心处出现低硬度。抗拉强度先增大后减小，延伸率减小。对断口的观察揭示了断裂模式从韧性到脆性的相应转变。
Disks of an extruded magnesium WE43 alloy are processed by high‐pressure torsion (HPT) and the evolutions of microstructure and mechanical properties are investigated in detail. Excellent grain refinement is achieved by HPT processing with a reduction in grain size from an initial value of ≈12 μm to a final value of ≈200–300 nm after 10 turns. The microhardness increases significantly with HPT processing but low hardness values are recorded at the centers of the disks. The tensile strength initially increases and then decreases while the elongation decreases. Observations of the fracture surfaces reveal a corresponding transition of the fracture mode from ductile to brittle.