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SiCp/2009Al复合材料的激光冲击强化：微观结构演变、残余应力与疲劳行为

Laser Shock Peening of SiCp/2009Al Composites: Microstructural Evolution, Residual Stress and Fatigue Behavior.

作者信息

Sun Rujian, Cao Ziwen, Zhang Yongxin, Zhang Hepeng, Yu Yingwei, Che Zhigang, Wu Junfeng, Zou Shikun, Guo Wei

机构信息

Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China.

Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering, AVIC Manufacturing Technology Institute, Beijing 100024, China.

出版信息

Materials (Basel). 2021 Feb 26;14(5):1082. doi: 10.3390/ma14051082.

DOI:10.3390/ma14051082
PMID:33652572
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7956191/
Abstract

SiC particle reinforced aluminum alloy has a wide application in the aerospace industries. In this study, laser shock peening (LSP), an advanced surface modification technique, was employed for SiCp/2009Al composite to reveal its microstructure, microhardness and residual stress evolution. After peening, high densities of dislocations were induced in the aluminum substrate, and stacking faults were introduced into the SiC particle. The microhardness was increased from 155-170 HV to 170-185 HV, with an affected depth of more than 1.5 mm. Compressive residual stresses of more than 200 MPa were introduced. The three-point bending fatigue of the base material, laser peened and milled after laser peened specimens with artificial crack notch fabricated by a femtosecond laser was investigated. The average fatigue lives of laser peened and milled after laser peened specimens were increased by up to 10.60 and 2.66 times, compared with the base material. This combined fundamental and application-based research seeks to comprehensively explore the applicability of LSP on metal matrix composite.

摘要

碳化硅颗粒增强铝合金在航空航天工业中有着广泛的应用。在本研究中，采用先进的表面改性技术——激光冲击喷丸（LSP）对SiCp/2009Al复合材料进行处理，以揭示其微观结构、显微硬度和残余应力的演变。喷丸后，在铝基体中诱导出高密度位错，并在碳化硅颗粒中引入堆垛层错。显微硬度从155 - 170 HV提高到170 - 185 HV，影响深度超过1.5 mm。引入了超过200 MPa的压缩残余应力。研究了母材、激光喷丸以及激光喷丸后经飞秒激光制造人工裂纹缺口并铣削后的试样的三点弯曲疲劳性能。与母材相比，激光喷丸试样以及激光喷丸后铣削试样的平均疲劳寿命分别提高了10.60倍和2.66倍。这项基于基础研究和应用研究相结合的工作旨在全面探索激光冲击喷丸在金属基复合材料上的适用性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/89c3/7956191/bca91eafe128/materials-14-01082-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/89c3/7956191/bca91eafe128/materials-14-01082-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/89c3/7956191/6a9b36acfccf/materials-14-01082-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/89c3/7956191/31a2079235c6/materials-14-01082-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/89c3/7956191/a98c8cfb569d/materials-14-01082-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/89c3/7956191/ae959243a463/materials-14-01082-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/89c3/7956191/bca91eafe128/materials-14-01082-g011.jpg

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