Liang Yunhong, Zhao Qian, Li Xiujuan, Zhang Zhihui, Ren Luquan
The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China; State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China.
The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China.
Micron. 2016 Aug;87:10-7. doi: 10.1016/j.micron.2016.04.007. Epub 2016 Apr 20.
The microstructure and mechanical properties of white clam shell were investigated, respectively. It can be divided into horny layer, prismatic layer and nacreous layer. Crossed-lamellar structure was the microstructural characteristic. The extension direction of lamellae in prismatic layer was different from that in nacreous layer, which formed an angle on the interface between prismatic layer and nacreous layer. The phase component of three layers was CaCO3 with crystallization morphology of aragonite, which confirmed the crossed-lamellar structural characteristic. White calm shell exhibited perfect mechanical properties. The microhardness values of three layers were 273HV, 240HV and 300HV, respectively. The average values of flexure and compression strength were 110.2MPa and 80.1MPa, respectively. The macroscopical cracks crossed the lamellae and finally terminated within the length range of about 80μm. It was the microstructure characteristics, the angle on the interface between prismatic and nacreous layer and the hardness diversity among the different layers that enhanced mechanical properties of white calm shell.
分别对白蛤壳的微观结构和力学性能进行了研究。它可分为角质层、棱柱层和珍珠层。交错层状结构是其微观结构特征。棱柱层中薄片的延伸方向与珍珠层中的不同，在棱柱层和珍珠层之间的界面上形成一个角度。三层的相成分均为碳酸钙，结晶形态为文石，这证实了交错层状结构特征。白蛤壳表现出优异的力学性能。三层的显微硬度值分别为273HV、240HV和300HV。弯曲强度和抗压强度的平均值分别为110.2MPa和80.1MPa。宏观裂纹穿过薄片，最终在约80μm的长度范围内终止。正是微观结构特征、棱柱层和珍珠层之间界面上的角度以及不同层之间的硬度差异增强了白蛤壳的力学性能。
