Size dependent strengthening mechanisms in carbon nanotube reinforced metal matrix composites

作者：Dong, Shuhong; Zhou, Jianqiu^*; Hui, David; Wang, Ying; Zhang, Shu

来源：Composites Part A: Applied Science and Manufacturing , 2015, 68: 356-364.

DOI：10.1016/j.compositesa.2014.10.018

• Metal matrix composites (MMCs)
• Microstructures
• Stress transfer
• Analytical modeling

The matrix grain size plays a dual role in metal matrix composites (MMCs). Contrary to enhance the strength of matrix, grain refinement can weaken the thermal expansion mismatch strengthening induced by the reinforcement. In this article, a dislocation density based model is developed to describe the factors affecting the strengthening mechanisms in Carbon nanotube (CNT)-reinforced MMCs with different matrix grain sizes. Two kinds of thermal expansion mismatch strengthening mechanisms are considered, i.e., geometrically necessary dislocations (GNDs) are distributed in entire matrix and GNDs are limited in dislocation punched zones (DPZs). In addition, comparisons between the predictions and some available experimental results are also performed.

• 出版日期2015-1
• 单位武汉工程大学