Effect of various aging treatment on thermal stability of a novel Al-Zn-Mg-Cu alloy for oil drilling

Zhao, Juangang; Liu, Zhiyi; Bai, Song; Huang, Tiantian; Wang, Jian; Xie, Haoyu; Zeng, Diping

doi:10.1016/j.msea.2020.140490

Cited by 17 publications

(3 citation statements)

References 35 publications

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“…During the initial phase of low-temperature aging in the first stage, the alloy's grain interiors experience the development of numerous fine and dispersed GP zones or coherent precipitate phases. Subsequently, in the second stage, characterized by higher temperature and prolonged aging, the precipitate particles formed during the first stage transform into semi-coherent η' precipitates or equilibrium η precipitates [25,26]. Consequently, in the second-stage aging process, the size and quantity of precipitates within the alloy undergo changes influenced by aging temperature and duration, leading to variations in the alloy's strength and hardness with changing aging conditions.…”

Section: Impact Of Dual-stage Aging Treatment On Microstructure and P...mentioning

confidence: 99%

Impact of Aging Treatment on Microstructure and Performance of Al-Zn-Mg-Cu Alloy Thin Sheets

Li,

Zhang,

Zhang

et al. 2023

Metals

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Al-Zn-Mg-Cu alloy, recognized for its heat-treatable and super-high strength, is a pivotal material for critical structural components in aviation. Consequently, grasping the intricate relationship between heat treatment processes and the microstructural characteristics and properties of the Al-Zn-Mg-Cu alloy is of paramount practical significance. This study encompasses a spectrum of heat treatment methodologies, delving into the diverse effects of distinct aging treatments on the microstructure and performance of thin Al-Zn-Mg-Cu alloy sheets. The findings illuminate that short natural aging treatments bestow heightened strength and hardness upon the alloy, albeit at the expense of ductility. Nevertheless, the alloy retains commendable malleability, enabling significant cold deformation. In contrast, artificial aging markedly elevates the alloy’s strength and hardness, albeit concurrently inducing a precipitous decline in ductility, thereby attenuating the alloy’s cold formability.

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Section: Impact Of Dual-stage Aging Treatment On Microstructure and P...mentioning

confidence: 99%

Impact of Aging Treatment on Microstructure and Performance of Al-Zn-Mg-Cu Alloy Thin Sheets

Li,

Zhang,

Zhang

et al. 2023

Metals

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“…For instance, current oil drill pipes are usually exposed to high temperatures (less than 200 • C) and high pressure (the formation pressure of a 4000 m oil well is about 50-60 Mpa). With the depletion of shallow well oil resources, the trend of future oil exploration is gradually developing towards deep well drilling and offshore drilling, which puts forward higher requirements for drilling and production tools [7][8][9][10]. Al-Zn-Mg-Cu alloys are often used as a structural fuselage component during service at slightly elevated temperatures (83-177 • C) for a short period of time [11,12].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion

Han

et al. 2022

Metals

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In this work, Al-Zn-Mg-Cu powders containing 0.15 and 0.33 wt % oxygen were utilized to prepare high-strength aluminum alloys through the process of cold isostatic pressing, sintering, hot extrusion, and heat treatment. Microstructural and mechanical properties at elevated temperatures of 250, 350, and 450 °C were investigated by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and high-temperature tensile tests. Results showed that the tensile strengths of the obtained Al-Zn-Mg-Cu alloys with 0.15 wt % oxygen were 185, 46, and 18 MPa at 250, 350, and 450 °C, respectively. When the oxygen content of Al-Zn-Mg-Cu alloy rose to 0.33 wt %, the tensile strengths at the corresponding temperature reached up to 205, 68, and 25 MPa, respectively. The excellent high-temperature performance could be attributed to double hindrance to dislocation motion and grain boundary migration by a large amount of nano γ-Al2O3 created by the in-creased oxygen, thereby resulting in fine grains even at high temperatures.

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“…The results reveal that microstructure and mechanical properties are more sensitive to ambient temperature. Zhao [9] studied the thermal stability of 7085-T7452 alloy in oil drilling. The results showed that different aging pretreatments made the materials have different thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure Evolution of Typical Over-Aging State Al-Zn-Mg-Cu Alloy during Thermal Exposure

Cheng

2021

MSF

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Al-Zn-Mg-Cu alloy have been widely used in aerospace industry. However, there is still a lack of research on thermal stability of Al-Zn-Mg-Cu alloy products. In the present work, an Al-Zn-Mg-Cu alloy with T79 and T74 states was placed in the corresponding environment for thermal exposure experiments. Performance was measured by tensile strength, hardness and electrical conductivity. In this paper, precipitation observation was analyzed by transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HREM). The precipitations of T79 state alloy were GPⅡ zone, η' phase and η phase while the ultimate tensile strength, hardness and electrical conductivity were 571MPa, 188.2HV and 22.2MS×m-1, respectively. The mechanical property of T79 state alloy decreased to 530MPa and 168.5HV after thermal exposure. The diameter of precipitate increased and the precipitations become η' and η phase at the same time. During the entire thermal exposure, T74 state alloy had the same mechanical property trend as T79 state alloy. The precipitate diameter also increased while the types of precipitate did not change under thermal exposure. The size of precipitates affected the choice of dislocation passing through the particles to affect the mechanical properties.

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Effect of various aging treatment on thermal stability of a novel Al-Zn-Mg-Cu alloy for oil drilling

Cited by 17 publications

References 35 publications

Impact of Aging Treatment on Microstructure and Performance of Al-Zn-Mg-Cu Alloy Thin Sheets

Impact of Aging Treatment on Microstructure and Performance of Al-Zn-Mg-Cu Alloy Thin Sheets

Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion

Mechanical Properties and Microstructure Evolution of Typical Over-Aging State Al-Zn-Mg-Cu Alloy during Thermal Exposure

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