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

doi:10.1016/j.msea.2021.141955

	Strong elemental interaction enhances the thermal stability of coherent precipitation strengthened Cu–Ni–Al alloys
	Li, Z. M.1; Li, X. N.1; Yuan, J. H.1; Hu, Y. L.1; Zheng, Y. H.2; Cheng, Z. L.1; Liu, R. W.3; Bao, C. M.4; Dong, C.1
	2021-10-19
发表期刊	Materials Science and Engineering A
ISSN	09215093
卷号	827
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.
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
DOI	10.1016/j.msea.2021.141955
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000700118600005
出版者	Elsevier Ltd
EI入藏号	20213810910673
EI主题词	Precipitation (chemical)
EI分类号	541.2 Aluminum Alloys ; 544.2 Copper Alloys ; 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals ; 641.1 Thermodynamics ; 802.3 Chemical Operations ; 921 Mathematics ; 931.3 Atomic and Molecular Physics ; 931.4 Quantum Theory ; Quantum Mechanics
来源库	WOS
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/151134
专题	兰州理工大学
通讯作者	Li, X. N.
作者单位	1.Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China; 2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China; 3.Shimadzu China Co LTD, Shanghai 200233, Peoples R China; 4.Shenyang Blower Works Grp Corp, Shenyang 110142, Peoples R 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).