The dynamic compressive response of a high-strength magnesium alloy and its nanocomposite

被引：23
作者：
Chen, Y. [1 ]
Tekumalla, S. [1 ]
Guo, Y. B. [1 ]
Shabadi, R. [2 ]
Shim, V. P. W. [1 ]
Gupta, M. [1 ]
机构：
[1] Natl Univ Singapore, Dept Mech Engn, 9 Engn Dr 1, Singapore 117575, Singapore
[2] Univ Lille 1 Sci & Technol, UMR CMS 8207, Unite Mat & Transformat, Lab Phys Met & Mat Engn, F-59650 Villeneuve Dascq, France
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 702卷
关键词：
Magnesium nanocomposite; Dynamic compression; Twinning; Solute strengthening; Negative strain rate sensitivity; STRAIN-RATE; GRAIN-SIZE; MICROSTRUCTURAL EVOLUTION; MECHANICAL RESPONSE; DEFORMATION; BEHAVIOR; TENSILE; PHASE; RATES; SLIP;
D O I：
10.1016/j.msea.2017.07.005
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The dynamic compressive mechanical properties of the alloy Mg-4Zn-3Gd-1Ca (wt%) and its nanocomposite Mg4Zn3Gd1Ca-2ZnO were investigated at strain rates up to 1 x 10(3) s(-1), using a Split Hopkinson Pressure Bar (SHPB) tester. Under dynamic loading, the addition of 2 wt% ZnO nanoparticles into the alloy generated a significant strength increase (similar to 100 MPa), attributed largely to grain refinement. Negative strain rate sensitivity of the alloy and its nanocomposite was observed. It is postulated that the strengthening influence of the nanoparticles by retarding twin nucleation/growth at grain boundaries, is significantly weakened as strain rate increases. The yield stress of the materials studied follows the Hall-Petch relationship even when the grain size is less than 1 mu m. It is proposed that the strong solute strengthening from Gd and Ca enhances the critical resolved shear stress for slip and preserves tension twinning as the dominant deformation mechanism for yielding.
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收藏
页码：65 / 72
页数：8
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