Li Zulai, Wang Pengfei, Shan Quan, Jiang Yehua, Wei He, Tan Jun
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China.
Materials (Basel). 2018 Jun 11;11(6):984. doi: 10.3390/ma11060984.
In this work, tungsten carbide particles (WC, spherical and irregular particles)-reinforced iron matrix composites were manufactured utilizing a liquid sintering technique. The mechanical properties and the fracture mechanism of WC/iron matrix composites were investigated theoretically and experimentally. The crack schematic diagram and fracture simulation diagram of WC/iron matrix composites were summarized, indicating that the micro-crack was initiated both from the interface for spherical and irregular WC/iron matrix composites. However, irregular WC had a tendency to form spherical WC. The micro-cracks then expanded to a wide macro-crack at the interface, leading to a final failure of the composites. In comparison with the spherical WC, the irregular WC were prone to break due to the stress concentration resulting in being prone to generating brittle cracking. The study on the fracture mechanisms of WC/iron matrix composites might provide a theoretical guidance for the design and engineering application of particle reinforced composites.
在本研究中，采用液相烧结技术制备了碳化钨颗粒（WC，球形和不规则颗粒）增强铁基复合材料。从理论和实验两方面研究了WC/铁基复合材料的力学性能和断裂机理。总结了WC/铁基复合材料的裂纹示意图和断裂模拟图，结果表明，球形和不规则WC/铁基复合材料的微裂纹均在界面处萌生。然而，不规则WC有形成球形WC的趋势。随后，微裂纹在界面处扩展为较宽的宏观裂纹，导致复合材料最终失效。与球形WC相比，不规则WC由于应力集中而易于断裂，从而易于产生脆性开裂。对WC/铁基复合材料断裂机理的研究可能为颗粒增强复合材料的设计和工程应用提供理论指导。
