Mechanical properties, corrosion behavior and microstructures of a non-isothermal ageing treated Al-Zn-Mg-Cu alloy

Peng, Xiaomin; Guo, Qi; Liang, Xiaopeng; Deng, Ying; Gu, Yi; Xu, Guofu; Yin, Zhoulan

doi:10.1016/j.msea.2017.01.086

Cited by 157 publications

(37 citation statements)

References 42 publications

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“…Wang et al [ 25 ] investigated the stress corrosion resistance of an Al–Zn–Mg alloy with a small content of additions, subjected to two-stage precipitation hardening. Successively, comprehensive considerations on the effect of variant heat treatment of Al–Zn–Mg–Cu (7085) alloy on microstructure and mechanical properties, and, in particular, resistance to intercrystalline and stress corrosion, were the subject of research led by Peng et al [ 26 ]. The effect of precipitation hardening parameters on microstructure of an Al–Zn–Mg–Sc–Zr alloy, which in turn determines stress corrosion resistance, was undertaken by Huang et al [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical Properties, and Corrosion Resistance of Thermomechanically Processed AlZn6Mg0.8Zr Alloy

et al. 2018

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The paper presents results of the investigations on the effect of low-temperature thermomechanical treatment (LTTT) on the microstructure of AlZn6Mg0.8Zr alloy (7000 series) and its mechanical properties as well as electrochemical and stress corrosion resistance. For comparison of the LTTT effect, the alloy was subjected to conventional precipitation hardening. Comparative studies were conducted in the fields of metallographic examinations and static tensile tests. It was found that mechanical properties after the LTTT were better in comparison to after conventional heat treatment (CHT). The tested alloy after low-temperature thermomechanical treatment with increasing plastic deformation shows decreased electrochemical corrosion resistance during potentiodynamic tests. The alloy after low-temperature thermomechanical treatment with deformation degree in the range of 10 to 30% is characterized by a high resistance to stress corrosion specified by the level of PSCC indices.

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Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical Properties, and Corrosion Resistance of Thermomechanically Processed AlZn6Mg0.8Zr Alloy

et al. 2018

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“…These fine precipitates were identified as nano-scaled GP zones and ©A phase in some reported results. 14) Furthermore, some Al 3 (Sc, Zr) phase with the bean-like shape can be seen inside the ¡-Al matrix due to the addition of Sc element, and the Al 3 (Sc, Zr) phase also exhibits a larger average size than the GP zones and ©A phase, as shown in Fig. 5.…”

Section: Microstructural Observationmentioning

confidence: 95%

Influence of Minor Sc Addition on Microstructure and Mechanical Properties of Extruded Al–7Zn–2Mg–1.5Cu–0.1Zr Alloy in T6 Heat Treatment

2019

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The effects of minor Sc on microstructure and mechanical properties of Al7Zn2Mg1.5Cu0.1Zr alloy under different aging time were investigated by means of tensile test, scanning electron microscopy and transmission electron microscopy, respectively. The results show that the aging strengthening tendency of Al7Zn2Mg1.5Cu0.1Zr(0.2Sc) alloys exhibits the similar feature. After T6 treatment, the maximum values of ultimate tensile strength and yield strength are 700 MPa and 602 MPa, respectively. The tensile fracture of Al7Zn2Mg1.5Cu 0.1Zr(0.2Sc) alloys exhibits a mixed ductile-brittle fracture. The results of TEM observation show that large amounts of GP zones and ©A phase distribute homogeneously inside the grains, and some rod-like precipitates distribute along grain boundaries in two alloys. Besides, there also exist lots of Al 3 (Sc, Zr) phase in Al7Zn2Mg1.5Cu0.1Zr0.2Sc alloy with different treated states. The grain refinement strengthening and precipitation strengthening play the dominant role in the strength increase of the Al7Zn2Mg1.5Cu0.1Zr0.2Sc alloy.

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“…Jiang et al [16,17] investigated the precipitation behaviors and enhanced properties of an Al-Zn-Mg-Cu alloy during the NIA process, and found that appropriate NIA treatment allowed alloys to achieve higher performance than typical aging treatments in a shorter period of time. It was reported by Peng et al [18] that, under NIA treatment, GPI zones were predominantly formed by homogeneous nucleation in the highly supersaturated solid solution at the early stage during aging, improving the initial increment of both hardness and tensile strength. With increasing temperature, fine η' phases precipitated, resulting in a further improvement in strength.…”

Section: Introductionmentioning

confidence: 93%

Precipitate Behavior, Mechanical Properties and Corrosion Behavior of an Al-Zn-Mg-Cu Alloy during Non-Isothermal Creep Aging with Axial Tension Stress

Zhu

Jiang

et al. 2020

Metals

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Theprecipitate behavior, mechanical properties and corrosion behavior of an Al-Zn-Mg-Cu alloy during non-isothermal creep aging were investigated. The results show that diffraction patterns of GPI zones gradually disappear and those of η′ phases are strengthened during the heating stage. More importantly, the size and volume fraction of precipitates increase with aging temperature increasing, which greatly enhances the mechanical properties of the alloy. The hardness and tensile strength of the alloy with H210 aging condition are 165 HV and 564 MPa, respectively. During the cooling stage, in addition to the diffraction pattern of η′ phase, that of GPI zones can be observed again. Furthermore, the size of the precipitates decreases, and the volume fraction reaches a maximum. The hardness and tensile strength of the alloy with C120 aging condition reach 185 HV and 580 MPa, respectively. Furthermore, the characteristics of the grain boundary reveal that the width of precipitation free zones (PFZ) first increases during the heating stage and then decreases during the cooling stage. In the C120 condition, the newly generated secondary precipitates and the coarsening of undissolved precipitates around the grain boundary lead to the further narrowing of PFZ, but the coarse grain boundary precipitates (GBPs) are still not continuously distributed in the grain boundary. Hence, the alloy with C120 condition exhibits the most excellent corrosion resistance.

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Mechanical properties, corrosion behavior and microstructures of a non-isothermal ageing treated Al-Zn-Mg-Cu alloy

Cited by 157 publications

References 42 publications

Microstructure, Mechanical Properties, and Corrosion Resistance of Thermomechanically Processed AlZn6Mg0.8Zr Alloy

Microstructure, Mechanical Properties, and Corrosion Resistance of Thermomechanically Processed AlZn6Mg0.8Zr Alloy

Influence of Minor Sc Addition on Microstructure and Mechanical Properties of Extruded Al–7Zn–2Mg–1.5Cu–0.1Zr Alloy in T6 Heat Treatment

Precipitate Behavior, Mechanical Properties and Corrosion Behavior of an Al-Zn-Mg-Cu Alloy during Non-Isothermal Creep Aging with Axial Tension Stress

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