A new type of anti-phase boundaries in the T(Al20Cu2Mn3) phase and the pre-deformation effect on T phase precipitation

Chen, Y.Q.; Tang, Zhenheng; Pan, Suping; Liu, W.H.; Song, Yufeng; Liu, Y.; Zhu, Biwu; Zhou, Wu‐Xing; Shen, Fanghua

doi:10.1016/j.intermet.2020.106977

Cited by 18 publications

(2 citation statements)

References 33 publications

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“…Previous studies have been focused on revealing the crystal structure of the T Mn phase (orthorhombic structure with lattice parameters a = 2.42 nm, b = 1.25 nm, and c = 0.775 nm) [20,21] and its interface relationship with the matrix, but few investigations have been emphasized the impact of the T Mn phase on mechanical properties [22][23][24]. The two conspicuous benefits of Mn addition to the Al-Cu-Mg-x Mn alloys are summarized as follows: (i) a multitude of T Mn particles formed during homogenization can impede the movement of dislocations to improve strength [25,26], (ii) the distinct formation temperature between the T Mn and conventional precipitates overcomes the adversity of the synchronous precipitation of dual-strengthening precipitates [17].…”

Section: Introductionmentioning

confidence: 99%

Coupled Precipitation of Dual-Nanoprecipitates to Optimize Microstructural and Mechanical Properties of Cast Al–Cu–Mg–Mn Alloys via Modulating the Mn Contents

Zhang,

Hao,

et al. 2023

Nanomaterials

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The effect of Mn content on the microstructure evolution and mechanical properties of Al–Cu–Mg–x Mn alloys at ambient temperature was investigated. The findings show that in the Mn-containing alloys at the as-cast state, the blocky primary T(Al20Cu2Mn3) phase coexisting with the Al2Cu phase appeared. With the increase in Mn content, the majority of the Al2Cu phase dissolved, nd a minor amount of the T phase remained at the grain boundary after solution treatment. The rod-like TMn (Al20Cu2Mn3) nanoprecipitate was simultaneously distributed at grain boundaries and the interiors, while a high density of needle-like θ″ (Al3Cu) nanoprecipitate was also observed in the T6 state. Further increases in Mn content promoted the dispersion of the TMn phase and inhibited the growth and transformation of the θ″ phase. Tensile test results show that 0.7 wt.% Mn alloy had excellent mechanical properties at ambient temperature with ultimate tensile strength, yield strength, and fracture elongation of 498.7 MPa, 346.2 MPa, and 19.2%, respectively. The subsequent calculation of strengthening mechanisms elucidates that precipitation strengthening is the main reason for the increase in yield strength of Mn-containing alloys.

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Section: Introductionmentioning

confidence: 99%

Coupled Precipitation of Dual-Nanoprecipitates to Optimize Microstructural and Mechanical Properties of Cast Al–Cu–Mg–Mn Alloys via Modulating the Mn Contents

Zhang,

Hao,

et al. 2023

Nanomaterials

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“…In some cases, the temperature of some certain special vehicles reaches more than 200°C, 5 and the temperature of some aerospace engines reaches more than 1000°C, 6 the working condition of high temperature requires better thermal shock resistance, better friction properties, and heat dissipation of rolling bearings. 7 In recent years, scholars have conducted in-depth research on the properties of various materials, [8][9][10] Engineering ceramics such as zirconia and silicon nitride are used to be made full ceramic ball bearings, and exhibit excellent thermal shock resistance in wide temperature ranges. Therefore, there is a great applied prospect under the working conditions of a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the misalignment of full ceramic ball bearing rotor system caused by varying gap in wide temperature ranges

Bai

Zheng

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The temperature-varying gap between the full ceramic ball bearings and the steel pedestal in wide temperature ranges leads to misalignment of the bearing rotor system, and there is a significant impact on the vibration of the rotor system. In this paper, the dynamic model considering the temperature-varying gap and time-varying contact between the full ceramic ball bearing and the steel pedestal in wide temperature ranges is proposed. The rigid body elements and the inner rings are coupled in the model, and the influence of the temperature-varying gap is analyzed. Results show that the increased gap at high temperatures brings about the looseness of the full ceramic ball bearing, the misalignment occurs between the axes of the two full ceramic ball bearings due to the looseness. The interaction between the full ceramic ball bearing and the steel pedestal becomes more significant, which causes the vibration of the rotor system to rise. Appropriately increase the interference between the full ceramic ball bearing and the steel pedestal helps reduce the gap at high temperature, thus avoiding the excessive vibration caused by misalignment and improving the rotation accuracy of the rotor system. The research results provide a reference basis for the use of full ceramic ball bearings in wide temperature ranges.

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Microstructural Evolution, Precipitation Behavior, and Mechanical Property Response of Cast Al–Li–Cu–Cd–Mn–Zr–Ti Alloy

Shao,

Jin,

et al. 2024

Adv Eng Mater

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The microstructural evolution and mechanical properties of cast Al–Li–Cu–Cd–Mn–Zr–Ti alloy during heat treatment are investigated systematically. In these findings, it is shown that the as‐cast alloy exhibits fine and equiaxed grains. During the solid solution treatment, Al20Cu2Mn3 dispersoids effectively restrict grain growth, and reducing the solid solution time has a similar effect. Subsequently, the precipitation behavior and its effect on the mechanical properties during the aging process are revealed. Al3(Ti, Zr) particles are uniformly distributed throughout the matrix, acting as nucleation sites for δ′, θ′, and T1 precipitates. Overtime, δ′ precipitates gradually coarsen and decrease in number, and some δ′ precipitates attach to Al3(Ti, Zr) particles, forming core–shell Al3(Li, Ti, Zr) phases. At the same time, plate‐shaped θ′ and T1 precipitates emerge and coarsen. After aging at 160 °C for 24 h, the alloy exhibits an excellent combination of strength (yield strength =293.3 ± 4 MPa, ultimate tensile strength =468.0 ± 3 MPa) and ductility (elongation =9.6 ± 0.4%), surpassing those reported in other cast Al–3Li–2Cu–X alloys. Critically, the underlying mechanisms behind the microstructure and mechanical properties are discussed extensively, providing valuable insights for the advancement of cast Al–Li alloys.

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A new type of anti-phase boundaries in the T(Al20Cu2Mn3) phase and the pre-deformation effect on T phase precipitation

Cited by 18 publications

References 33 publications

Coupled Precipitation of Dual-Nanoprecipitates to Optimize Microstructural and Mechanical Properties of Cast Al–Cu–Mg–Mn Alloys via Modulating the Mn Contents

Coupled Precipitation of Dual-Nanoprecipitates to Optimize Microstructural and Mechanical Properties of Cast Al–Cu–Mg–Mn Alloys via Modulating the Mn Contents

Investigation on the misalignment of full ceramic ball bearing rotor system caused by varying gap in wide temperature ranges

Microstructural Evolution, Precipitation Behavior, and Mechanical Property Response of Cast Al–Li–Cu–Cd–Mn–Zr–Ti Alloy

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