材料工程2024，Vol.52Issue(4)：164-175,12.DOI:10.11868/j.issn.1001-4381.2023.000144
SiCp分布对SiCp/2024Al复合材料组织和性能及变形行为的影响
Effects of SiCp distribution on microstructure,mechanical properties and deformation behavior of SiCp/2024 Al composites
摘要
Abstract
SiCp/2024Al composite was prepared by semi-solid stirring casting,and the distribution of SiCp was regulated by multi-step deformation of hot extrusion and multi-direction forging(MDF).The effects of SiCp distribution on the microstructure and properties of SiCp/2024Al composite ware studied.The results show that hot extrusion deformation cause SiCp to distribute along the extrusion direction(ED).After multi-directional forging,SiCp distribution is improved significantly,and it changes from directional distribution to uniform distribution.After 1MDF,the SiCp distribution along the ED changes to disordered distribution,and the mechanical properties of the material are sharply decreased.After 3MDF,the distribution uniformity of SiCp is improved,and the mechanical properties of the material are greatly improved.When the forging passes increase to 6,the distribution uniformity of SiCp is further improved,the mechanical properties of the material decrease with the partial SiCp breaking.When the forging number is 3,the mechanical properties of the composite are optimal,with yield strength,ultimate tensile strength and elongation are 264 MPa,387 MPa and 7%,respectively.Compared with the directionally distributed composite,the uniform distribution of SiCp effectively relieves the local stress concentration,and the matrix alloy stores more dislocation.In addition,when the distribution uniformity of SiCp is improved,the Al2Cu phase is also refined.The diffuse distribution of Al2Cu phase hinders the slip of dislocation,resulting in a uniformly distributed composite with a higher work hardening rate and internal stress.In order to study the effect of SiCp distribution on softening behavior of composites,cyclic stress relaxation experiments are carried out.In the process of stress cycling,the uniformly distributed SiCp/2024Al composites with uniform distribution of SiCp and Al2Cu phases exhibit a better stress relaxation resistance.关键词
SiCp分布/铝基复合材料/软化行为/多向锻造/加工硬化Key words
SiCp distribution/aluminum matrix composites/softening behavior/multi-directional forging/work hardening分类
通用工业技术引用本文复制引用
薛鹏鹏,邓坤坤,聂凯波,史权新,刘力..SiCp分布对SiCp/2024Al复合材料组织和性能及变形行为的影响[J].材料工程,2024,52(4):164-175,12.基金项目
国家重点研发计划青年科学家项目(2021YFB3703300) （2021YFB3703300）
国家自然科学基金(52271109) （52271109）
吕梁市重点研发项目(Rc2020-108) （Rc2020-108）
