Numerical Calculations on Thermodynamic Parameters in Solidification and Average Grain Sizes of Bulk Nanocrystalline Fe3Al Based Alloys Prepared by Aluminothermic Reaction Casting

doi:10.1166/nnl.2013.1606

	Numerical Calculations on Thermodynamic Parameters in Solidification and Average Grain Sizes of Bulk Nanocrystalline Fe3Al Based Alloys Prepared by Aluminothermic Reaction Casting
	La, Peiqing; Guo, Xin; Lu, Xuefeng; Zhang, Dan; Wang, Hong Ding; Wei, Yupeng
刊名	NANOSCIENCE AND NANOTECHNOLOGY LETTERS
	2013-07
卷号	5 期号:7 页码:719-725
关键词	Numerical Calculation Bulk Nanocrystalline Fe3Al Based Alloys Average Grain Size Aluminothermic Reaction Casting
ISSN号	1941-4900
DOI	10.1166/nnl.2013.1606
英文摘要	Numerical calculations on thermodynamic parameters in solidification of homogeneous nucleation and the effects of alloying elements on average grain sizes in bulk nanocaystalline Fe3Al based alloys prepared by aluminothermic reaction casting were conducted. As the undercooling increases from 100 K to 400 K, the critical activation energy of solidification drops dramatically and the critical radius of nucleus decreases from 2.3 nm to 0.5 nm. The thermodynamic driving force of nucleation increases from 100 MJ . m(-3) to 600 MJ . m(-3), but the nucleation rate changes little until the undercooling comes to 300 K and subsequently shows a significant change, increasing rapidly to 9.6 x 10(21) m(-3) . s(-1). Calculated average grain sizes decrease gradually from 568 nm to 68 nm as the undercooling increases from 300 K to 500 K for the alloy with 5 wt.%Cr, while decrease first and then increase for the alloys with 10 wt.% and 15 wt.%Cr, and increase continuously for the alloy with 20 wt.%Cr. Calculated average grain sizes decrease through the sequence of Mn, Cr, Mo, and Ni alloying elements, respectively, and fall into the scope of 9 to 73 nnn, which are well in accordance with the experimental data.
资助项目	National Natural Science Foundation of China[51164022]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
出版者	AMER SCIENTIFIC PUBLISHERS
WOS记录号	WOS:000320908800001
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/34662]
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	La, Peiqing
作者单位	Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	La, Peiqing,Guo, Xin,Lu, Xuefeng,et al. Numerical Calculations on Thermodynamic Parameters in Solidification and Average Grain Sizes of Bulk Nanocrystalline Fe3Al Based Alloys Prepared by Aluminothermic Reaction Casting[J]. NANOSCIENCE AND NANOTECHNOLOGY LETTERS,2013,5(7):719-725.
APA	La, Peiqing,Guo, Xin,Lu, Xuefeng,Zhang, Dan,Wang, Hong Ding,&Wei, Yupeng.(2013).Numerical Calculations on Thermodynamic Parameters in Solidification and Average Grain Sizes of Bulk Nanocrystalline Fe3Al Based Alloys Prepared by Aluminothermic Reaction Casting.NANOSCIENCE AND NANOTECHNOLOGY LETTERS,5(7),719-725.
MLA	La, Peiqing,et al."Numerical Calculations on Thermodynamic Parameters in Solidification and Average Grain Sizes of Bulk Nanocrystalline Fe3Al Based Alloys Prepared by Aluminothermic Reaction Casting".NANOSCIENCE AND NANOTECHNOLOGY LETTERS 5.7(2013):719-725.