Microstructures and mechanical properties of α‐SiC ceramics after high‐temperature laser shock peening
Microstructures and mechanical properties of α‐SiC ceramics after high‐temperature laser shock peening
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高温激光冲击强化α-SiC陶瓷的显微组织与力学性能
DOI：
10.1111/jace.18222
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发表时间：
2021
影响因子：
3.9
通讯作者：
Cui, Bai
中科院分区：
文献类型：
--
作者：
Wang, Fei;Chen, Xin;DeLellis, Daniel P.;Krause, Amanda R.;Lu, Yongfeng;Cui, Bai
为了提高多晶α-SiC的力学性能，采用了一种新的高温激光冲击强化（HT-LSP）工艺。HT‐LSP防止了表面上微裂纹的形成，同时在基面上以位错滑移的形式诱导塑性变形，这可能是由高冲击压力和1000℃下较低的临界分解剪切应力的组合引起的。利用拉曼光谱法测得，激光冲击在α-SiC表面引入了650 MPa的最大残余压应力，使α-SiC的纳米硬度和面内断裂韧性分别提高了8%和36%.这项工作为HT-LSP应用于脆性陶瓷以提高其塑性和机械性能提供了基础。
A novel high‐temperature laser shock peening (HT‐LSP) process was applied to polycrystalline α‐SiC to improve the mechanical performance. HT‐LSP prevents microcrack formation on the surface while induces plastic deformation in the form of dislocation slip on the basal planes, which may be caused by the combination of high shock pressure and a lower critical resolved shear stress at 1000℃. A maximum compressive residual stress of 650 MPa, measured with Raman spectroscopy, was introduced into the surface of α‐SiC by HT‐LSP, which can increase the nanohardness and in‐plane fracture toughness of α‐SiC by 8% and 36%, respectively. This work presents a fundamental base for the promising applications of HT‐LSP to brittle ceramics to increase their plasticity and mechanical properties.