Molecular Dynamics Study on Mechanical Properties of Nickel-based Single Crystal Superalloys Containing Voids
DONG Huicong1, YANG Liu1, GENG Changjian2, SU Ru1,*, LIU Meng3
1 School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China 2 China Aviation Development Shenyang Engine Research Institute, Shenyang 110015, China 3 AVIC Shangda Superalloy Materials Limited Company, Xingtai 054800,Hebei, China
Abstract: Nickel-based single crystal superalloys have been widely used in aerospace due to their superior properties, but there are inevitable void defects in the manufacturing process, which affect the mechanical properties of the alloy. The effects of temperature, strain rate and void shape on the tensile mechanical properties and dislocation evolution of nickel-based single crystal superalloy have been studied by molecular dynamics simulation. Results show that temperature and strain rate affect the mechanical properties of materials. With the increase of temperature, Young's modulus, yield strength and material strength are all decreased;With the increase of strain rate, the young's modulus of the material remains unchanged and the yield strength increases. In addition, the presence of voids reduces the strength and Young's modulus of the material. Young's modulus of models with different shapes of voids is the same, while strength of those is different. Due to the acute angle of the diamond-shaped void, the dislocations are more likely to aggregate, the yield strength is smaller, and it is more likely to be broken during the stretching process.
作者简介: 董会苁,河北科技大学材料学院讲师、硕士研究生导师。2012年于河北科技大学金属材料与工程专业本科毕业,2012—2017年于燕山大学亚稳材料国家重点实验室进行硕博连读,博士毕业后到河北科技大学工作至今。目前主要从事高温合金力学性能及半导体材料热传导性能等方面的计算机模拟工作。以第一作者或通信作者身份发表论文10余篇,包括Physical Chemistry Chemical Physics、Materials Science and Engineering:C、Journal of Materials Research and Technology、Materials Letters等。
引用本文:
董会苁, 杨柳, 耿长建, 苏孺, 刘猛. 含空洞镍基单晶高温合金力学性能的分子动力学研究[J]. 材料导报, 2023, 37(15): 21100100-8.
DONG Huicong, YANG Liu, GENG Changjian, SU Ru, LIU Meng. Molecular Dynamics Study on Mechanical Properties of Nickel-based Single Crystal Superalloys Containing Voids. Materials Reports, 2023, 37(15): 21100100-8.
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2023, Vol. 37 
