文献类型：期刊文献

英文题名：Experimental and first-principles calculation study on influence of stacking faults on hardness and anisotropy of M7C3 carbides

作者：Geng, Baoyu[1,3];Deng, Peichang[2,3];Li, Youchi[1,3];Hu, Jiezhen[1,3]

机构：[1]Guangdong Ocean Univ, Sch Mech Engn, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Coll Chem & Environm, Zhanjiang 524088, Guangdong, Peoples R China;[3]Zhanjiang Key Lab Corros & Protect Ocean Engn Equi, Zhanjiang 524088, Guangdong, Peoples R China

年份：2023

卷号：968

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：SCI-EXPANDED(收录号：WOS:001082111700001)、、EI(收录号：20233914802014)、Scopus(收录号：2-s2.0-85172327212)、WOS

基金：Acknowledgments This work was supported by a program for scientific research start-up funds of Guangdong Ocean University, the Zhanjiang Science and Technology Plan Project (2022B01007) and Science & Technology Development Fundation of Zhanjiang (2022A01029) .

语种：英文

外文关键词：Stacking faults; Hardness; Anisotropy; First-principles calculation

外文摘要：M7C3 often exhibits stacking faults (SFs). However, the influence of SFs on carbide properties are rarely studied. To explore effects of SFs, the carbide hardness, elastic modulus, and distribution of hardness and elastic modulus in the grain were analyzed using nanoindentation technology. The SFs structure of M7C3 carbides was analyzed using transmission electron microscopy (TEM). First-principles calculations revealed the influence mechanism of SFs on carbide hardness. The results showed that high-density SFs improved the carbide hardness by approxi-mately 2 GPa. Uneven distribution of SFs leads to uneven hardness and elastic modulus of M7C3 carbides. The SFs disrupt the ordered arrangement of C-Cr bonds, which reduces the anisotropy of Cr7C3. The change in carbide strength was not due to the change in bond strength. Instead, the lattice distortion caused by the change in the C-Cr bond angle in Cr7C3-SFs increased the deformation resistance of the crystal and improved the hardness of Cr7C3.