کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1428976 | 1509184 | 2014 | 8 صفحه PDF | دانلود رایگان |
• Three microstructurally different regions were recognized in magnetite cap.
• Microstructure texture is different for different region.
• The hardness varies considerably over the regions.
• Self-sharpening is related to the microstructure texture and hardness of different regions.
The magnetite cap of chiton tooth (Acanthochiton rubrolineatus) was studied with SEM. Three microstructurally distinct regions were recognized: Region I, close to the anterior surface of the cusp and composed of thick rod microstructure units; Region III, close to the posterior surface and composed of fine fibers; and Region II, sandwiched between Regions I and II and composed of thin sheets. The microstructure units in the three regions constitute a continuous and integrated architecture component. The hardness of Regions I and II was measured to be Hv270 and Hv490, respectively. Based on these microstructure observation and hardness data, the abrasive behavior and microstructural mechanism of self-sharpening of the chiton tooth were discussed in the paper. The self-sharpening was attributed to the combined effect of the hardness and the texture orientation of the microstructure units in Regions I and II.
Journal: Materials Science and Engineering: C - Volume 37, 1 April 2014, Pages 1–8