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超细晶纯镁的阻尼与力学性能研究
Study on Damping and Mechanical Properties of Ultrafine-grained Pure Magnesium
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- DOI:
- 作者:
- 杨 靖 1 ， 2 ，樊建锋 1 ， 2 ，任 睿 1 ， 2
YANG Jing 1,2 , FAN Jianfeng 1,2 , REN Rui 1,2
- 作者单位:
- 1. 太原理工大学 新材料界面科学与工程教育部重点实验室，山西 太原 030024；2. 太原理工大学 材料科学与工程学 院，山西 太原 030024
1. Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China; 2. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- 关键词:
- 纯镁；可动位错密度；晶界；力学性能；阻尼
pure magnesium; mobile dislocation density; grain boundary; mechanical properties; damping
- 摘要:
- 通过高能球磨法制备了晶粒尺寸为 15 μm 、 11 μm 、 560 nm 和 98 nm 的纯镁样品，从可动位错密度、晶粒尺
寸、晶界吸收位错等方面分析了阻尼性能和力学性能的平衡。 结果表明，随着晶粒尺寸由微米级减小至纳米级，材料的
抗拉强度和屈服强度逐渐增加，其中， 98 nm 晶粒尺寸试样的屈服强度和抗拉强度分别达到了 135 MPa 和 274 MPa 。 所
有试样的阻尼曲线都符合 G-L 理论，属于位错型阻尼，且随晶粒尺寸的减小先增后降，晶粒尺寸为 560 nm 试样的应变
振幅阻尼性能最佳。
Pure magnesium samples with grain sizes of 15 μm, 11 μm, 560 nm and 98 nm were prepared by high-energy
ball milling. The balance between damping and mechanical properties was analyzed from the aspects of movable
dislocation density, grain size and grain boundary absorption dislocation. The results show that the tensile strength and yield
strength increase gradually with the grain size decreasing from micron to nanometer, and the yield strength and tensile
strength of the sample with 98 nm grain size reach 135 MPa and 274 MPa, respectively. The damping curves of all samples
conform to G-L theory and belong to dislocation damping, which increases first and then decreases with the decrease of
grain size. The strain amplitude damping performance of the sample with grain size of 560 nm is the best.