In this paper, the effect of two-stage homogenisation treatment on the evolution of the second phase was investigated. The microstructure of the extruded 7055 aluminium alloy was composed of α(Al) matrix and other second phases, including MgZn2, Al2CuMg, and Al7Cu2Fe phases. The segregation of second phase was serious and the content was 27.9%. During the 460°C × 24 h homogenisation, MgZn2 phases dissolved quickly, but there was still a significant amount of Al2CuMg phases present. After two-stage homogenisation (460°C × 24 h + 480°C × 10 h), the content of Al2CuMg phase decreased from 15% to 3% and the degree of segregation was reduced. In addition, the mechanical properties of the extruded 7055 alloy were effectively improved.
ZhangPLiYYLiuYAAnalysis of the microhardness, mechanical properties and electrical conductivity of 7055 aluminum alloy. Vacuum. 2020;171:109005.
2.
AzarniyaATaheriAKTaheriKK.Recent advances in ageing of 7xxx series aluminum alloys: a physical metallurgy perspective. J Alloys Compd. 2019;781:945–983.
3.
KumarRGuptaADandekarTREvolution of microstructure and texture during homogenization in a strip cast AA8011 aluminum alloy. Intermetallics. 2021;130:107064.
4.
PangJJLiuFCLiuJFriction stir processing of aluminium alloy AA7075: microstructure, surface chemistry and corrosion resistance. Corros Sci. 2016;106:217–228.
5.
RenJWangRCPengCQMultistage aging treatment influenced precipitate characteristics improve mechanical and corrosion properties in powder hot-extruded 7055 Al alloy. Mater Charact. 2020;170:110683.
6.
ZhangZLiuDWangYSA novel method for preparing bulk ultrafine-grained material: three dimensional severe plastic deformation. Mater Lett. 2020;276:128209.
7.
PadapAKYadavAPKumarPEffect of aging heat treatment and uniaxial compression on thermal behavior of 7075 aluminum alloy. Mater Today Proc. 2020;33:5442–5447.
8.
KhanMAWangYWAnjumMJEffect of heat treatment on the precipitate behaviour, corrosion resistance and high temperature tensile properties of 7055 aluminum alloy synthesis by novel spray deposited followed by hot extrusion. Vacuum. 2020;174:109185.
9.
SavonovGDSCamarinhaMGGRochaLOStudy of the influence of the RRA thermal treatment and plasma nitriding on corrosion behavior of 7075-T6 aluminum alloy. Surf Coat Technol. 2019;374:736–744.
10.
ShanZJLiuSDYeLYEffect of three-stage homogenization on recrystallization and fatigue crack growth of 7020 aluminum alloy. J Mater Res Technol. 2020;9(6):13216–13229.
11.
QianXMLiXLLiYMicrostructure evolution during homogenization and hot workability of 7055 aluminum alloy produced by twin-roll casting. J Mater Res Technol. 2021;13:2536–2550.
12.
XiangKYLeiXCDingLPOptimizing mechanical property of spray formed Al-Zn-Mg-Cu alloy by combination of homogenization and warm-rolling. Mater Sci Eng A. 2022;846:143248.
13.
RenJWangRCFengYMicrostructure evolution and mechanical properties of an ultrahigh strength Al-Zn-Mg-Cu-Zr-Sc (7055) alloy processed by modified powder hot extrusion with post aging. Vacuum. 2019;161:434–442.
14.
ChenKHLiuHWZhangZThe improvement of constituent dissolution and mechanical properties of 7055 aluminum alloy by stepped heat treatments. J Mater Process Technol. 2003;142:190–196.
15.
CongFGZhaoGJiangFEffect of homogenization treatment on microstructure and mechanical properties of DC cast 7X50 aluminum alloy. Trans Nonferrous Met Soc China. 2015;25:1027–1034.
16.
WuHWenSPLuJTMicrostructural evolution of new type Al−Zn−Mg−Cu alloy with Er and Zr additions during homogenization. Trans Nonferrous Met Soc China. 2017;27:1476–1482.
17.
AfshariBMMirjavadiSSDolatabadYAEffects of pre-deformation on microstructure and tensile properties of Al−Zn−Mg−Cu alloy produced by modified strain induced melt activation. Trans Nonferrous Met Soc China2016;26:2283–2295.
18.
ShiYJPanQLLiMJMicrostructural evolution during homogenization of DC cast 7085 aluminum alloy. Trans Nonferrous Met Soc China. 2015;25:3560–3568.
19.
WenKXiongBQZhangYGMicrostructure evolution of a high zinc containing Al-Zn-Mg-Cu alloy during homogenization. Rare Met Mater Eng. 2017;46(4):928–934.
20.
JiaZHXieZQXiangKYEffect of heat treatment and extrusion processing on the microstructure and mechanical properties of spray formed 7055 alloy. Mater Charact. 2021;183:111619.
21.
LiYLuBYuWTwo-stage homogenization of Al-Zn-Mg-Cu-Zr alloy processed by twin-roll casting to improve L12 Al3Zr precipitation, recrystallization resistance, and performance. J Alloys Compd. 2021;882:160789.
22.
KongiangSPlookpholTWannasinJEffect of the two-step solution heat treatment on the microstructure of semisolid cast 7075 aluminum alloy. Adv Mat Res. 2012;488-489:243–247.
23.
XuDKRometschPABirbilisN.Improved solution treatment for an as-rolled Al–Zn–Mg–Cu alloy. Part II. Microstructure and mechanical properties. Mater Sci Eng A. 2012;534:244–252.
24.
ShewmanPG.Diffusion in solids. New York: McGraw-Hill; 1963. p. 61.
25.
JiangHCYeLYZhangXMIntermetallic phase evolution of 5059 aluminum alloy during homogenization. Trans Nonferrous Met Soc China. 2013;23:3553–3560.
26.
SamarasSNHaidemenopoulosGN.Modelling of microsegregation and homogenization of 6061 extrudable Al-alloy. J Mater Process Technol. 2007;194:63–73.
27.
WangHJXuJKangYLStudy on inhomogeneous characteristics and optimize homogenization treatment parameter for large size DC ingots of Al–Zn–Mg–Cu alloys. J Alloys Compd. 2014;585:19–24.
28.
FanXGJiangDMMengQCThe microstructural evolution of an Al–Zn–Mg–Cu alloy during homogenization. Mater Lett. 2006;60:1475–1479.
29.
BirbilisNCavanaughMKBuchheitRG.Electrochemical behavior and localized corrosion associated with Al7Cu2Fe particles in aluminum alloy 7075-T651. Corros Sci. 2006;48:4202–4215.
30.
SunYWPanQLSunYQLocalized corrosion behavior associated with Al7Cu2Fe intermetallic in Al-Zn-Mg-Cu-Zr alloy. J Alloys Compd. 2019;783:329–340.
31.
ChiuYCDuKTBorHYThe effects of Cu, Zn and Zr on the solution temperature and quenching sensitivity of Al–Zn–Mg–Cu alloys. Mater Chem Phys. 2020;247:122853.
32.
TodaHKobayashiTTakahashiA.Mechanical analysis of toughness degradation due to premature fracture of course inclusions in wrought aluminium alloys. Mater Sci Eng A. 2000;280:69–75.
33.
LiuBLeiQXieLQMicrostructure and mechanical properties of high product of strength and elongation Al-Zn-Mg-Cu-Zr alloys fabricated by spray deposition. Mater Des. 2016;96:217–223.
34.
SokolowskiJHDjurdjevicMBKierkusCAImprovement of 319 aluminum alloy casting durability by high temperature solution treatment. J Mater Process Technol. 2001;109:174–180.
35.
JiaPFCaoYHGengYDEffects of d.c. current on the phase transformation in 7050 alloy during homogenization. Mater Charact. 2014;96:21–27.
36.
XuDLiZHWangGJPhase transformation and microstructure evolution of an ultrahigh strength Al-Zn-Mg-Cu alloy during homogenization. Mater Charact. 2017;131:285–297.
37.
QiYZhangHZhuJJMechanical behavior and microstructure evolution of Al-Cu-Mg alloy produced by laser powder bed fusion: effect of heat treatment. Mater Charact. 2020;165:110364.
38.
ChenJZZhenLYangSJInvestigation of precipitation behavior and related hardening in AA 7055 aluminum alloy. Mater Sci Eng A. 2009;500:34–42.
39.
GuoCKangCRLiuQAtomic-scale investigation of coarsening kinetics by the phase-field crystal model. Europhys Lett. 2021;135:56002.
