Effects of pressure on microstructure and mechanical properties of SiCp/2024 Al-based composites fabricated by powder thixoforming

doi:10.1007/s10853-016-0493-4

	Effects of pressure on microstructure and mechanical properties of SiCp/2024 Al-based composites fabricated by powder thixoforming
	Li, Pubo; Chen, Tijun; Qin, He
刊名	JOURNAL OF MATERIALS SCIENCE
	2017-02
卷号	52 期号:4 页码:2045-2059
关键词	Fabrication Grain refinement Microstructure Silicon Solidification Strain hardening Stress analysis Al based composite Geometrically necessary dislocations Loading capacities Microstructure and mechanical properties Solidification behaviors Solidification rate Strengthening mechanisms Ultimate tensile strength
ISSN号	0022-2461
DOI	10.1007/s10853-016-0493-4
英文摘要	SiCp/2024 composites were fabricated by powder thixoforming, and the effects of pressure on the microstructure and mechanical properties were studied. The results indicate that the pressure applied during thixoforming affected the secondary solidification behavior by altering the solidification rate, microstructure compactness, plastic deformation, loading capacity of SiCp, and thus the fracture regimes and the mechanical properties. The tensile strengths increased as the pressure increased from 128 to 224 MPa because of the improved compactness, enhanced work hardening and loading capacity of SiCp, and increased concentration of the theta-phase and then decreased owing to the serious stress concentration and theta-phase harmfulness. The composite thixoformed under 224 MPa exhibited the largest improvements, with an ultimate tensile strength of 388 MPa, a 0.2 % offset yield strength (YS) of 297 MPa, and an elongation of 3.8 %, which were increased by 29.3 and 35 % and decreased by 63.5 %, respectively, compared with those of the 2024 alloy. The increment in the tensile strength was due to the synergetic contributions resulting from the strengthening mechanisms of load transfer, thermal mismatch, geometrically necessary dislocations, and grain refinement.
资助项目	Basic Scientific Fund of Gansu University[G2014-07] ; Program for New Century Excellent Talents of the University of China[NCET-10-0023]
WOS研究方向	Materials Science
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000389409400021
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/33379]
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
通讯作者	Chen, Tijun
作者单位	Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Li, Pubo,Chen, Tijun,Qin, He. Effects of pressure on microstructure and mechanical properties of SiCp/2024 Al-based composites fabricated by powder thixoforming[J]. JOURNAL OF MATERIALS SCIENCE,2017,52(4):2045-2059.
APA	Li, Pubo,Chen, Tijun,&Qin, He.(2017).Effects of pressure on microstructure and mechanical properties of SiCp/2024 Al-based composites fabricated by powder thixoforming.JOURNAL OF MATERIALS SCIENCE,52(4),2045-2059.
MLA	Li, Pubo,et al."Effects of pressure on microstructure and mechanical properties of SiCp/2024 Al-based composites fabricated by powder thixoforming".JOURNAL OF MATERIALS SCIENCE 52.4(2017):2045-2059.