Effect of Shot Peening on Residual Stress and Microstructure ofAl18B4O33 Whisker Reinforced Aluminum Matrix Composite

WU Yihan; JIANG Chuanhai

doi:10.11973/jxgccl202012011

Materials and Mechanical Engineering > 2020 > 44(12): 62-66. > DOI: 10.11973/jxgccl202012011

WU Yihan, JIANG Chuanhai. Effect of Shot Peening on Residual Stress and Microstructure ofAl₁₈B₄O₃₃ Whisker Reinforced Aluminum Matrix Composite[J]. Materials and Mechanical Engineering, 2020, 44(12): 62-66. DOI: 10.11973/jxgccl202012011

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Effect of Shot Peening on Residual Stress and Microstructure ofAl₁₈B₄O₃₃ Whisker Reinforced Aluminum Matrix Composite

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

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Received Date: October 29, 2019
Revised Date: August 30, 2020

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Abstract

Abstract

Conventional (room temperature) and warm (200 ℃) shot peening treatments were performed on Al₁₈B₄O₃₃ whisker reinforced aluminum matrix composite, and the residual stress distribution of the surface layer after shot peening was studied. The microstructure of the surface layer was investigated by X-ray diffraction profile analysis and the microhardness was also studied. The results show that the residual compressive stress of the surface layer of the composite after shot peening increased first and then decreased with increasing distance from the surface (depth); the residual compressive stress after warm shot peening was greater than that after conventional shot peening. The domain size of the surface layer increased with the depth after shot peening, and the microstrain decreased; the domain size and microstrain after warm peening were both smaller than those after conventional shot peening. The dislocation density and microhardness of the surface layer decreased with increasing depth after shot peening, and the dislocation density and the microhardness after warm peening were higher than those after conventional shot peening.
- warm peening,
- aluminum matrix composite,
- Al₁₈B₄O₃₃ whisker,
- residual stress,
- microstructure

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Effect of Shot Peening on Residual Stress and Microstructure ofAl18B4O33 Whisker Reinforced Aluminum Matrix Composite

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Effect of Shot Peening on Residual Stress and Microstructure ofAl₁₈B₄O₃₃ Whisker Reinforced Aluminum Matrix Composite