Strong elemental interaction enhances the thermal stability of coherent precipitation strengthened Cu–Ni–Al alloys

doi:10.1016/j.msea.2021.141955

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Strong elemental interaction enhances the thermal stability of coherent precipitation strengthened Cu–Ni–Al alloys
	Li, Z.M.3; Li, X.N.3; Yuan, J.H.3; Hu, Y.L.3; Zheng, Y.H.1; Cheng, Z.L.3; Liu, R.W.2; Bao, C.M.4; Dong, C.3
刊名	Materials Science and Engineering A
	2021-10-19
卷号	827
关键词	Aluminum alloys Binary alloys Calculations Copper alloys Dissolution Free energy Gibbs free energy Grain boundaries Nickel compounds Silicon alloys Thermodynamic stability Work function Coherent precipitation Cu content Discontinuous precipitation Grain-boundaries High-temperature properties Lattice misfits matrix NiAl alloy Re-dissolution Si addition
ISSN号	09215093
DOI	10.1016/j.msea.2021.141955
英文摘要	Coherent cuboidal precipitation of γ′ (Ni3Al) phases can significantly improve the high temperature properties of Cu–Ni–Al alloys, in which, substantial γ′ phases and a suitable lattice misfit degree between γ (Cu matrix) and γ′ phase (δγ-γ′) is necessary. However, the re-dissolution and grain boundary discontinuous precipitation would induce the degradation of heating resistance in the alloys with higher Cu content. Herein introducing Si with strong elemental interaction to resolve this issue. In this research, series of Cu85.71Ni10.72-x Al3.57Six (x = 0, 0.45, 0.89, 1.34 and 1.79) alloys are designed and prepared, and the effect of Si addition on microstructure, properties at room or high temperature are investigated. The results demonstrate that Si with completely solution state has an effect on the promoting of γ′ precipitation and suppression of the discontinuous precipitation. Meanwhile, Si addition regulates the δγ-γ′, transforming the shape of γ′ phases from spherical to cuboidal and delaying the re-dissolution of γ′ phase and improving the stability of matrix. First-principles calculations and work function results indicate that Gibbs free energy ΔG of γ′ phase decreases as well as exhibiting a more negative cohesive energy Eb for a suitable Si addition, which enables the alloys to be more stable and homogeneous. Si exhibits a good optimization effect for Cu–Ni–Al–Si alloy, which leads to excellent high temperature properties that can be extended to alloys with higher Cu content by Si addition. Therefore, multi-componentization is an efficient way to improve the properties of Cu–Ni–Al alloys, and an appropriate match in elemental interaction is crucial. The research provides theoretical and experimental basis for the development of heat-resistant Cu alloy with good comprehensive properties. © 2021 Elsevier B.V.
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000700118600005
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/151134]
专题	省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals (Lanzhou University of Technology), Lanzhou; 730050, China; 2.Shimadzu China Co. LTD, Shanghai; 200233, China; 3.Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian; 116024, China; 4.Shenyang Blower Works Group Corporation, Shenyang; 110142, China
推荐引用方式 GB/T 7714	Li, Z.M.,Li, X.N.,Yuan, J.H.,et al. Strong elemental interaction enhances the thermal stability of coherent precipitation strengthened Cu–Ni–Al alloys[J]. Materials Science and Engineering A,2021,827.
APA	Li, Z.M..,Li, X.N..,Yuan, J.H..,Hu, Y.L..,Zheng, Y.H..,...&Dong, C..(2021).Strong elemental interaction enhances the thermal stability of coherent precipitation strengthened Cu–Ni–Al alloys.Materials Science and Engineering A,827.
MLA	Li, Z.M.,et al."Strong elemental interaction enhances the thermal stability of coherent precipitation strengthened Cu–Ni–Al alloys".Materials Science and Engineering A 827(2021).