Effects of germanium on quench sensitivity in Al–Zn–Mg–Zr alloy

Lin, Liangwu; Liu, Zhiyi; Bai, Song; Ying, Pengzhan; Wang, Xiaohu

doi:10.1016/j.matdes.2015.07.169

Cited by 22 publications

(2 citation statements)

References 30 publications

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“…Most scholars usually use TTT (Time-Temperature-Transformation) curve and TTP (Time-Temperature-Property) curve to study the quenching sensitivity of alloys. Lin [4] demonstrated that as compared to Ge-free alloy, according to the TTP method showed much lower quench sensitivity for Ge-bearing alloy. The addition of a small amount of Ge was able to trap excess vacancies, leading to a decrease in the amount of coarsed dispersoids and resultant low quench sensitivity in Ge-bearing alloys.…”

Section: Introductionmentioning

confidence: 99%

Study of Quench Sensitivity and Microstructure Evolution of Al-Mg-Si Alloy Sheets

Gao

Xiong

2022

KEM

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In the actual industrial production process, it is usually appropriate to reduce the cooling rate and control the residual stress. In this study, the Time-Temperature-Property curve of Al-Mg-Si alloy sheets was measured by interruption quenching and subsequent artificial aging method. The microstructure evolution of Al-Mg-Si alloy was carefully characterized using optical microscopy (OM) and transmission electron microscopy (TEM). It was found that the nose temperature of the TTP curve drawn by experiment was ~360°C, closing to the nose temperature of ~365°C obtained from the simulated TTT curves. The number of equilibrium phase rapidly increased with the increasing of holding time, while no obvious equilibrium phase formation at the low temperature region and high temperature region. The critical cooling rate is 14.3°C/s, the determination of the critical cooling rate has important reference value for the control of alloy sheet during quenching process in the actual industrial production. The quenching sensitive region of the Al-Mg-Si alloy sheet is between 290°C and 440°C.

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Section: Introductionmentioning

confidence: 99%

Study of Quench Sensitivity and Microstructure Evolution of Al-Mg-Si Alloy Sheets

Gao

Xiong

2022

KEM

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“…In this situation, the as-deposited alloy could be deformed under controllable parameters without being subjected to pre-homogenization heat treatment [9]. Recently, significant efforts have been made to study the hot deformation behaviors [10][11][12][13][14][15], quenching sensitivity [16][17][18][19], corrosion resistance [20-23] and weldability [24-29] of 7055. However, few reports were concerned with the improvement of homogenization in microstructure with less energy or short processes.…”

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confidence: 99%

Hot Extrusion Enhanced Homogenization of Microstructure in a Spray Deposition Aluminum Alloy

Sheng

Yang

et al. 2020

Metals

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Homogeneous heat treatment serves the significant roles in eliminating the segregation and tuning the microstructure of alloy ingot. It usually cost tremendous power and time to achieve a homogeneous microstructure for aluminum alloys. In this article, the hot extrusion was directly introduced on the spray deposited aluminum alloy 7055 ingot before performing heat treatment to explore the newly feasible homogeneous routine. Equiaxed grains without dendrites or PPB were obtained in our current parameters of spray deposition, which allowed the as-deposited alloy to be deformed without being subjected to pre-homogeneous heat treatment. Significant amount of stored energy was produced during hot extrusion at 420 • C with area reduction ratio of 6.25, which effectively promoted the homogeneity of microstructure and reduced significantly the heat treatment time. A newly feasible short routine, heat treatment at 450 • C /6 h + 470 • C/1 h following the hot extrusion, proved capable of obtaining a homogeneous microstructure for the spray deposited aluminum alloy 7055. macro segregation could be improved by long-time homogenization heat treatment after casting, but it took tremendous power and time to achieve a uniform distribution of elements. It was well accepted that the diffusion of atoms would be accelerated under the combined effects of heat and stress [5]. However, the cast billet cannot be directly deformed due to the existence of macro segregation and casting defects, i.e., voids, concentration of elements, which would lead to the occurrence of cracks if not controlled properly. Thus, the as-cast aluminum alloy 7055 was usually subjected to homogeneous heat treatment at 46-47 • C for 24 h before deformation [6].Fortunately, spray deposition, a rapid solidification process, was proposed in the 1960s and was firstly applied in fabrication of super-high strength aluminum alloy in the 1990s [7,8]. With the assistance of spray deposition method, the aluminum alloy with high alloying could be produced with segregation being controlled at the micro-scale level. In this situation, the as-deposited alloy could be deformed under controllable parameters without being subjected to pre-homogenization heat treatment [9]. Recently, significant efforts have been made to study the hot deformation behaviors [10][11][12][13][14][15], quenching sensitivity [16][17][18][19], corrosion resistance [20-23] and weldability [24-29] of 7055. However, few reports were concerned with the improvement of homogenization in microstructure with less energy or short processes. In this article, hot extrusion was introduced to directly extrude the billet after spray deposition, wherein the microstructure evolution and corresponding mechanism during hot deformation and extrusion were uncovered. The subsequent heat treatment was employed to evaluate the effects of parameters on microstructure evolution of the hot-extruded alloy. Significant amount of stored energy was produced during hot extrusion at 420 • C with the area reduction ratio of 6.25, whic...

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Quench Sensitivity of AA 7136 Alloy: Contribution of Grain Structure and Dispersoids

Tang

Yang

Liu

et al. 2019

Metall Mater Trans A

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Effects of germanium on quench sensitivity in Al–Zn–Mg–Zr alloy

Cited by 22 publications

References 30 publications

Study of Quench Sensitivity and Microstructure Evolution of Al-Mg-Si Alloy Sheets

Study of Quench Sensitivity and Microstructure Evolution of Al-Mg-Si Alloy Sheets

Hot Extrusion Enhanced Homogenization of Microstructure in a Spray Deposition Aluminum Alloy

Quench Sensitivity of AA 7136 Alloy: Contribution of Grain Structure and Dispersoids

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