Liu Jingchuan, Zhang Lan, Jiang Fengchun, Zhang Mengqi, Wang Liquan, Yun Feihong
College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China.
Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
Materials (Basel). 2018 Jul 6;11(7):1152. doi: 10.3390/ma11071152.
A novel silicon carbide (SiC) continuous ceramic fiber-reinforced (CCFR) Ti/Al₃Ti Metal-Intermetallic-Laminate (MIL) composite was fabricated. A high-efficiency semi-analytical model was proposed based on the numerical equivalent inclusion method (NEIM) for analyzing the small-strain elasto-plastic contact in the early stage of the penetration process. The microstructure and interface features were characterized by the scanning electron microscopy (SEM). Quasi-static compression tests were performed to determine the contact response and validate the proposed model. A group of in-depth parametric studies were carried out to quantify the influence of the microstructure. The comparison between results under the sphere-plane and plane-plane contact load indicates that, under the first sphere-plane, the compressive strength and failure strain are both lower and the SiC reinforcement effect on strength is very clear while the effect on ductility is not clear. The maximum plastic strain concentration (MPSC) in the Al₃Ti layer is closest to the upper boundary of the central SiC fiber and then extends along the depth direction as the load increases, which are also the locations where cracks may initiate and extend. Moreover, the CCFR-MIL composite shows better mechanical properties when the center distance between adjacent SiC fibers is four times the fiber diameter and the volume fraction of Ti is 40%.
制备了一种新型的碳化硅（SiC）连续陶瓷纤维增强（CCFR）Ti/Al₃Ti金属间金属层状（MIL）复合材料。基于数值等效夹杂法（NEIM）提出了一种高效的半解析模型，用于分析侵彻过程早期的小应变弹塑性接触。通过扫描电子显微镜（SEM）对微观结构和界面特征进行了表征。进行了准静态压缩试验以确定接触响应并验证所提出的模型。开展了一组深入的参数研究以量化微观结构的影响。球-平面和平-平面接触载荷下结果的比较表明，在第一种球-平面情况下，抗压强度和破坏应变均较低，SiC对强度的增强作用非常明显，而对延性的作用不明显。Al₃Ti层中的最大塑性应变集中（MPSC）最接近中心SiC纤维的上边界，然后随着载荷增加沿深度方向延伸，这些也是裂纹可能萌生和扩展的位置。此外，当相邻SiC纤维之间的中心距为纤维直径的四倍且Ti的体积分数为40%时，CCFR-MIL复合材料表现出更好的力学性能。
