The bimodal effect of La on the microstructures and mechanical properties of in-situ A356–TiB2 composites |
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| Affiliation: | 1. Laboratory for Microstructure & Institute of Materials, Shanghai University, Shanghai 200072, China;2. Chongqing Key Laboratory of Photo-electric Functional Materials, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 400047, China;1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;2. State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-ferrous Metal Research, Xi''an 710016, China;3. Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China;4. Xi''an Sailong Metal Materials Co., Ltd, Xi''an 710016, China;1. Department of Mechanical Engineering Technology, Purdue University, 401 North Grant Street, West Lafayette, IN 47906, USA;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | In this work, in-situ A356–2.5 wt.% TiB2 composites were fabricated via a re-melting and diluting (RD) approach. The effects of lanthanum (La) on the microstructures and mechanical properties of the composites were investigated. The results demonstrated that the addition of La can, simultaneously, refine the second dendrite arm spacing (SDAS) of the α-Al grains and modify the coarse lamellar eutectic Si into fine fibrous particles. The optimum addition levels for refinement and modification lay at 0.1 wt.% and 0.8 wt.%, respectively, due to the distinct mechanisms between the two. Since the resultant mechanical properties are a combined function of refinement and modification, the tensile properties of the composites show a bimodal distribution with the first peak value at 0.1 wt.% and the latter one at 0.8 wt.% La, in accordance with the optimum refinement and modification, respectively. |
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