The performance of hybridized nano-ceramics on the microstructure and corrosion of Mg alloy in an auto-engine cooling system

被引:8
作者
Fayomi, J. [1 ,2 ]
Popoola, A. P. I. [1 ,2 ]
Popoola, O. M. [3 ]
机构
[1] Tshwane Univ Technol, Dept Chem Met & Mat Engn, PMB X680, Pretoria, South Africa
[2] Tshwane Univ Technol, Surface Engn Res Lab, PMB X680, Pretoria, South Africa
[3] Tshwane Univ Technol, Dept Elect Engn, PMB X680, Pretoria, South Africa
关键词
Spark plasma sintering; Nanoindentation; Corrosion; Microstructure; METAL-MATRIX COMPOSITE; AZ31 MAGNESIUM ALLOY; MECHANICAL-PROPERTIES; ELECTROCHEMICAL-BEHAVIOR; ALUMINUM-ALLOY; PURE MAGNESIUM; NANOINDENTATION; FABRICATION; TEMPERATURE; EXTRUSION;
D O I
10.1016/j.ceramint.2022.12.102
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
This current novel research focuses on developing a hybrid magnesium-based composite through the spark plasma sintering process with an interest in the improvement of mechanical properties and corrosion resistance of Mg Alloy in an auto-cooling system. AZ91D was selected as the primary Mg alloy and it was reinforced with hybridized AlN-VB at a sintering temperature of 500 degrees C, a heating rate of 75 degrees C/min, a pressure of 30 MPa, and a dwell time of 5 min. The microstructure of the sintered composite at varying weight constituents shows a ho-mogenous dispersion of the reinforcing material and refinement of the inherent eutectic beta-Mg17Al12 phase. The refinement of the phase yielded a small grain size of 16.6 +/- 0.20 mu m by the MgAZ91D-8wt%AlN-8wt%VB composite compared to the coarse grain size of 36.1 +/- 0.9 mu m by the unreinforced MgAZ91D. likewise, a higher microstrain value of 7.57E-2 was achieved by the composite with the highest reinforcing constituents. The load -displacement curve shows a gradual shift to the left following the inclusion of the reinforcing substances, this implies a higher resistance to penetration as a result of higher nanohardness and elastic modulus. The corrosion behavior of the sintered composite was examined in a simulated auto-engine cooling system using ethylene -glycol and corrosive water. The Unreinforced MgAZ91D shows a high corrosion rate (Cr) of 2.2217 mm/year, a higher degree of disorderliness (n) of 0.8829, and a low charge resistance transfer (Rct) of 4.6143 k omega cm2. However, the corrosion rate decreases rapidly to 0.0475 mm/year and the Rct to 20.9543 k omega cm2 at MgAZ91D-8wt%AlN-8wt%VB composite.
引用
收藏
页码:12423 / 12434
页数:12
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