Sc和Zr的复合添加对高Zn含量7xxx系铝合金组织演变和力学性能的影响

doi:10.19976/j.cnki.43-1448/TF.2024003

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (951 KB) HTML (0 KB)
Export: BibTeX | EndNote (RIS)

Abstract High Zn content 7xxx aluminum alloy with co-addition of Sc and Zr were prepared by traditional casting and thermomechanical processing technology in this paper. The effects of co-addition of Sc and Zr on the microstructure and mechanical properties of a 7xxx aluminum alloy with high Zn content was investigated by room temperature tensile test, scanning electron microscope, X-ray diffraction, and transmission electron microscope. The results show that the tensile strength of the newly designed and fabricated high Zn content aluminum alloy (w(Zn)=10.9%) is 769 MPa, while the elongation is 4.7%. The high Zn content directly leads to the formation of high density nanoscale η' phase, generating superior precipitation hardening effect. The primary Al₃(Sc,Zr) phase formed by the co-addition of Sc and Zr helps to refine the solidification structures, while the secondary Al₃(Sc,Zr) phase precipitated during aging effectively inhibits recrystallization and dislocation movements. These two aspects together result in exceptional grain boundary hardening effect.

Key words： high Zn content 7xxx aluminum alloy traditional casting precipitation mechanical property

Received: 08 January 2024 Published: 31 May 2024

ZTFLH:

TG146.4

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHANG Xiaoqiang
	WANG Feng
	HE Junyang
	GU Ji
	DU Yong
	SONG Min

Cite this article:

ZHANG Xiaoqiang,WANG Feng,HE Junyang, et al. Effects of Sc and Zr co-addition on structural evolution and mechanical properties of a 7xxx aluminum alloy with high Zn content[J]. Materials Science and Engineering of Powder Metallurgy, 2024, 29(2): 101-108.

URL:

http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2024003 OR http://pmbjb.csu.edu.cn/EN/Y2024/V29/I2/101

[1] ZOU Y, WU X D, TANG S B, et al.Investigation on microstructure and mechanical properties of Al-Zn-Mg-Cu alloys with various Zn/Mg ratios[J]. Journal of Materials Science & Technology, 2021, 85: 106-117.
[2] HEINZ A, HASZLER A, KEIDEL C, et al.Recent development in aluminium alloys for aerospace applications[J]. Materials Science and Engineering A, 2000, 280(1): 102-107.
[3] AZARNIYA A, TAHERI A K, TAHERI K K.Recent advances in ageing of 7xxx series aluminum alloys: a physical metallurgy perspective[J]. Journal of Alloys and Compounds, 2019, 781: 945-983.
[4] SENKOV O N, SHAGIEV M R, SENKOVA S V, et al.Precipitation of Al₃(Sc,Zr) particles in an Al-Zn-Mg-Cu-Sc-Zr alloy during conventional solution heat treatment and its effect on tensile properties[J]. Acta Materialia, 2008, 56(15): 3723-3738.
[5] PENG Y H, LIU C Y, WEI L L, et al.Quench sensitivity and microstructures of high-Zn-content Al-Zn-Mg-Cu alloys with different Cu contents and Sc addition[J]. Transactions of Nonferrous Metals Society of China, 2021, 31(1): 24-35.
[6] CHUNG T F, YANG Y L, HUANG B M, et al.Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy[J]. Acta Materialia, 2018, 149: 377-387.
[7] STARINK M J, MILKEREIT B, ZHANG Y, et al.Predicting the quench sensitivity of Al-Zn-Mg-Cu alloys: a model for linear cooling and strengthening[J]. Materials & Design, 2015, 88: 958-971.
[8] STARINK M J, WANG S C.A model for the yield strength of overaged Al-Zn-Mg-Cu alloys[J]. Acta Materialia, 2003, 51(17): 5131-5150.
[9] ZOU Y, WU X D, TANG S B, et al.Tailoring phase fractions of T′ and η′ phases in dual-phase strengthened Al-Zn-Mg-Cu alloy via ageing treatment[J]. Transactions of Nonferrous Metals Society of China, 2022, 32(10): 3182-3196.
[10] WU L M, SEYRING M, RETTENMAYR M, et al.Characterization of precipitate evolution in an artificially aged Al-Zn-Mg-Sc-Zr alloy[J]. Materials Science and Engineering A, 2010, 527(4): 1068-1073.
[11] LIU Y, LIANG S, JIANG D M.Influence of repetitious non-isothermal aging on microstructure and strength of Al-Zn-Mg-Cu alloy[J]. Journal of Alloys and Compounds, 2016, 689: 632-640.
[12] PENG X Y, GUO Q, LIANG X D, et al.Mechanical properties, corrosion behavior and microstructures of a non-isothermal ageing treated Al-Zn-Mg-Cu alloy[J]. Materials Science and Engineering A, 2017, 688: 146-154.
[13] ZHAO H, YE L Y, CHENG Q S, et al.Enhanced mechanical properties and corrosion resistance of 7055 aluminum alloy through variable-rate non-isothermal aging[J]. Journal of Alloys and Compounds, 2023, 943: 169198.
[14] JIANG B, YI D Q, YI X O, et al.Effect of trace amounts of added Sc on microstructure and mechanical properties of 2055 aluminum alloy[J]. Materials Characterization, 2018, 141: 248-259.
[15] DEV S, STUART A A, KUMAAR R C R D, et al. Effect of scandium additions on microstructure and mechanical properties of Al-Zn-Mg alloy welds[J]. Materials Science and Engineering A, 2007, 467(1): 132-138.
[16] CLOUET E, LAÉ L, ÉPICIER T, et al.Complex precipitation pathways in multicomponent alloys[J]. Nature Materials, 2006, 5(6): 482-488.
[17] YE J, PAN Q L, LIU B, et al.Effects of co-addition of minor Sc and Zr on aging precipitates and mechanical properties of Al-Zn-Mg-Cu alloys[J]. Journal of Materials Research and Technology, 2023, 22: 2944-2954.
[18] DENG Y, YIN Z M, ZHAO K, et al.Effects of Sc and Zr microalloying additions on the microstructure and mechanical properties of new Al-Zn-Mg alloys[J]. Journal of Alloys and Compounds, 2012, 530: 71-80.
[19] ZHANG M, LIU T, HE C N, et al.Evolution of microstructure and properties of Al-Zn-Mg-Cu-Sc-Zr alloy during aging treatment[J]. Journal of Alloys and Compounds, 2016, 658: 946-951.
[20] DENG P, MO W F, OUYANG Z Q, et al.Mechanical properties and corrosion behaviors of (Sc,Zr) modified Al-Cu-Mg alloy[J]. Materials Characterization, 2023, 196: 112619.
[21] LI B, PAN Q L, HUANG X, et al.Microstructures and properties of Al-Zn-Mg-Mn alloy with trace amounts of Sc and Zr[J]. Materials Science and Engineering A, 2014, 616: 219-228.
[22] WLOKA J, VIRTANEN S.Influence of scandium on the pitting behaviour of Al-Zn-Mg-Cu alloys[J]. Acta Materialia, 2007, 55(19): 6666-6672.
[23] LIU J, YAO P, ZHAO N Q, et al.Effect of minor Sc and Zr on recrystallization behavior and mechanical properties of novel Al-Zn-Mg-Cu alloys[J]. Journal of Alloys and Compounds, 2016, 657: 717-725.
[24] ZHANG S S, DU H Q, YAO Z J, et al.Superior high temperature creep resistance of a cast Al-Mg-Ca-Sc alloy with multi-scale hierarchical microstructures[J]. Materials Science and Engineering A, 2022, 850: 143533.
[25] SHARMA M M, AMATEAU M F, EDEN T J.Hardening mechanisms of spray formed Al-Zn-Mg-Cu alloys with scandium and other elemental additions[J]. Journal of Alloys and Compounds, 2006, 416(1): 135-142.
[26] WANG F, XIONG B Q, ZHANG Y Q, et al.Microstructure and mechanical properties of spray-deposited Al-10.8Zn-2.8Mg-1.9Cu alloy after two-step aging treatment at 110 and 150 ℃[J]. Materials Characterization, 2007, 58(1): 82-86.
[27] GUO S, NING Z L, CAO F Y, et al.Microstructural evolution of spray-formed Al-11.5Zn-2.0Mg-1.6Cu alloy during hot-extrusion and heat-treatment[J]. Transactions of Nonferrous Metals Society of China, 2009, 19(2): S343-S348.
[28] YIN H, WEN K, LI Z H, et al.Effect of Zn/Mg ratio on the microstructure and mechanical properties of as-cast Al-Zn-Mg-Cu alloys and the phase transformation during homogenization[J]. Journal of Materials Research and Technology, 2023, 26: 3646-3660.
[29] LI L B, LI R D, YUAN T C, et al.Microstructures and tensile properties of a selective laser melted Al-Zn-Mg-Cu (Al7075) alloy by Si and Zr microalloying[J]. Materials Science and Engineering A, 2020, 787: 139492.
[30] LI H C, CAO F Y, GUO S, et al.Effects of Mg and Cu on microstructures and properties of spray-deposited Al-Zn-Mg-Cu alloys[J]. Journal of Alloys and Compounds, 2017, 719: 89-96.
[31] MAKI N, IWAOKA H, HIROSAWA S.Development of thermally stable powder metallurgy Al-Mn alloy extrusions and prediction of their terminal strength after prolonged service periods at high temperatures[J]. Materials Science and Engineering A, 2020, 793: 139813.
[32] REN J, WANG R C, PENG C Q, et al.Ultra-high strength Al-Zn-Mg-Cu alloys with high zinc content prepared via powder hot extrusion[J]. Micron, 2021, 144: 103015.
[33] LI H C, CAO F Y, GUO S, et al.Microstructures and properties evolution of spray-deposited Al-Zn-Mg-Cu-Zr alloys with scandium addition[J]. Journal of Alloys and Compounds, 2017, 691: 482-488.
[34] SEIDMAN D N, MARQUIS E A, DUNAND D C.Precipitation strengthening at ambient and elevated temperatures of heat-treatable Al(Sc) alloys[J]. Acta Materialia, 2002, 50(16): 4021-4035.
[35] LEFEBVRE W, MASQUELIER N, HOUARD J, et al.Tracking the path of dislocations across ordered Al₃Zr nano-precipitates in three dimensions[J]. Scripta Materialia, 2014, 70: 43-46.