Ben Lin

State Key Laboratory of Nonferrous Metals and Processes

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Kai Wen

General Research Institute for Nonferrous Metals (China)

San-xi Deng

Central South University

Danyang Liu

Central South University

Guang-jun Zeng

Central South University

Zheng Gen Hu

China Academy of Launch Vehicle Technology

Tao Wang

Sichuan University

Yanan Li

PLA Army Engineering University

Tao Wang

Civil Aviation University of China

Baiqing Xiong

General Research Institute for Nonferrous Metals (China)

Xiwu Li

State Key Laboratory of Nonferrous Metals and Processes

Cooperative Institutions

Central South University

General Research Institute for Nonferrous Metals (China)

Grinm Advanced Materials (China)

State Key Laboratory of Nonferrous Metals and Processes

Łukasiewicz Research Network - Institute of Non-Ferrous Metals

Taiyuan University of Technology

Chinese Academy of Sciences

Zhejiang University

Beijing Institute of Technology

Aluminum Corporation of China (China)

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Study on the effect of annealing and solution treatment on the peripheral coarse grain of 2195 alloy

Journal of Physics Conference Series (2023)

Tao Wang Kai Wen Ben Lin Yanan Li Baiqing Xiong

Abstract In the actual production process, some aluminum alloys need to go through annealing heat treatment followed by solution treatment; this paper explores the evolution of peripheral coarse grain (PCG) structure during annealing and solution treatment by metallographic observation and electron back-scattered diffraction (EBSD) of materials in the extruded state, after different annealing heat treatments and different solution treatments. It was found that recrystallization occurred in the surface layer of the material during the extrusion process, and the recrystallized grains developed into PCG during the solution process. The PCG was smaller when the annealing temperature was too low, or the solution temperature was too high, but the PCG structure was thicker. The annealing time had no significant effect on the PCG structure. The coarse grains appeared first at the edge of the material and then engulfed each other to develop into several huge grains.

Recrystallization (geology)

10.1088/1742-6596/2566/1/012053

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Structure and thermomechanical behavior of NiTiPt shape memory alloy wires

Acta Biomaterialia (2008)

Ben Lin Ken Gall Hans Jürgen Maier R. D. Waldron

Pseudoelasticity

Nickel titanium

Texture (cosmology)

Ductility (Earth science)

Microscale chemistry

10.1016/j.actbio.2008.07.015

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Citations (46)

Second Phase Dissolution Evolution of an As-Cast Al-4.0Cu-1.0Li-0.4Mg-0.3Ag-0.1Zr Alloy during Multiple Homogenization Processes

Key engineering materials (2022)

Ben Lin Kai Wen Yong An Zhang Zheng Gen Hu Hui Qiang Wu

Homogenization treatment is vital for eliminating eutectic structure and ensuring a preferable microstructure foundation for Aluminum Lithium (Al-Li) alloys. In this paper, solidification phases in an as-cast Al-Li alloy were revealed and their evolutions during multiple homogenization processes were analyzed by means of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and differential scanning calorimetry (DSC) analysis. The results showed that the as-cast microstructure mainly contained needlelike Al 2 CuLi and Al 2 Cu phase, large size Cu-rich phases and netlike Ag-containing phases attached to them. As the alloy homogenized by 455°C/16h, except for needle-like phases inside grains, part of phases on grain boundaries had dissolved into the matrix and exhibited rounded shapes. As homogenized by 455°C/16h+495°C/16h, Ag-containing phase had completely dissolved into the matrix while the Cu-rich phases remained and showed two different morphologies depending on whether Mg element was contained. Prolonging the second homogenization time to 28h, no obvious change occurred for the Cu-rich phase. As homogenized by 455°C/16h+495°C/20h+512°C/20h, most Cu-rich phase had dissolved into the matrix while residual phase was mainly Fe-containing phase. This proposes an effective way to eliminate various solidification phases in Al-Li alloys and identify their contents.

Homogenization

Energy-dispersive X-ray spectroscopy

10.4028/p-6w455x

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Anisotropy of Al-Li alloy plate and its heredity effect in mechanical property distribution of spun-dome

Transactions of Nonferrous Metals Society of China (2023)

Ben Lin Pengcheng Ma Hao-ran LI San-xi Deng Guang-jun Zeng

The mechanical properties and grain structures of 2A55 Al−Li alloy plate with 20 mm in thickness after T6-aging at 165 °C for 24 h were investigated. The aging precipitates, grain structures and mechanical property distribution along the circumferential and axial directions in the T6-aged spun-dome with 1 m in diameter spin-deformed through the 2A55 Al−Li alloy plate with 20 mm in thickness were studied. The precipitates in the T6-aged dome include a great number of T1 (Al2CuLi) precipitates and a small number of δ′ (Al3Li) and θ′ (Al2Cu) precipitates. The distribution of T1 precipitates is uneven, which is characterized by dense distribution at subgrain boundaries and the formation of precipitate-free zone (PFZ) at high angle grain boundaries. The T6-aged plate possesses almost same strength along a same direction, but there exists anisotropy with the lowest strength along 45° direction and the highest strength along the rolling direction. The T6-aged dome possesses great mechanical property discrepancy along a same circumferential direction and axial direction, which is correlated with the variation of the angle of the dome circumferential direction and axial direction to the rolling direction and the resulting different textures and grain aspect ratio at different locations. There exists a heredity effect in the grain structures and mechanical properties from the original hot-rolled plate to the subsequent spin-deformed dome.

Dome (geology)

10.1016/s1003-6326(23)66185-0

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Effect of grain structure on fatigue crack propagation behavior of Al-Cu-Li alloys

Journal of Material Science and Technology (2023)

Dingding Lu Ben Lin Tianle Liu San-xi Deng Youjie Guo

Recrystallization (geology)

Grain boundary strengthening

Paris' law

10.1016/j.jmst.2022.10.085

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Citations (53)

Influence of Cryogenic Temperatures on the Mechanical Properties and Microstructure of 2195-T8 Alloy

Metals (2023)

Tao Wang Kai Wen Ben Lin Xiwu Li Yanan Li

The 2195 aluminum alloy is widely used in cryogenic storage tanks for space vehicles, where it can reach a temperature of 20 K. In order to explore the reasons for the increased strength of 2195 aluminum alloys at cryogenic temperatures, uniaxial tensile tests were conducted in the range of 20 K–298 K. Tensile fracture was observed. In addition, the microstructures under different temperatures were observed using EBSD (electron back-scattered diffraction) and TEM (transmission electron microscopy) techniques, and the dislocation density of the material was quantitatively characterized using the modified Williamsone–Hall method based on XRD (X-ray diffraction) analysis. The results indicated that the ultimate strength increased at an increasing rate with the temperature decrease, while the elongation increase was insignificant. The fracture’s surface exhibited that dimple characteristics seemed to be unapparent while the quantity of tearing ridges was enhanced by the temperature decrease. Meanwhile, the fracture mode changed from ductile to brittle fracture. The microdeformation degree revealed by KAM images showed an aggravating trend, and the deformation tended to be more uniform. The increasingly enhanced dislocation density quantitatively revealed by the modified Williamsone–Hall method also proved this and that the increase in dislocations had a similar trend to that of tensile strength, which was furtherly revealed by TEM images. This indicated that the more regions are involved in deformation, the more dislocations are generated in the material during deformation, resulting in an increase in strength at cryogenic temperatures.

Brittleness

Tearing

Ductility (Earth science)

10.3390/met13040740

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Effect of Aging Precipitate on Ductility Anisotropy and Low Cycle Fatigue Behavior of AA2195 Al-Li Alloy

Metals and Materials International (2023)

Gui Wang Ben Lin Dingding Lu San-xi Deng Guang-jun Zeng

Ductility (Earth science)

Hardening (computing)

10.1007/s12540-022-01365-8

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Citations (6)

Influence of grain structure and precipitates on fatigue crack propagation behaviors of Al-xCu-1.2Li-X alloys

Journal of Alloys and Compounds (2024)

Guang-jun Zeng Haoran Li Ben Lin Pengcheng Ma Xu-feng Cai

10.1016/j.jallcom.2024.176309

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Citations (1)

Effect of Extrusion and Annealing Treatment on Peripheral Coarse Grain Structure and Mechanical Property of an Al-Cu-Li-Mg Alloy Extrusion Profile

Advances in transdisciplinary engineering (2024)

Li Wang Kai Wen Ben Lin Tao Wang Xiwu Li

In the current study, the effects of extrusion and annealing treatment on the peripheral coarse grain (PCG) structure were investigated. The results showed that the edge of profiles recrystallized during the extrusion process, the grain size was in the range of 2-5 m and the degree of recrystallization had obvious heterogeneity along the extrusion direction, showing two kinds of recrystallization microstructure. The thickness of recrystallized microstructure at the head of the profile was 2 mm and there were obvious boundaries. The thickness of recrystallized microstructure at the tail reached 13 mm and there was no obvious boundary. The recrystallized grains grew abnormally to form PCG structure during the solution process. The PCG structure was significantly reduced when the extrusion ratio decreased from 20 to 14. The higher the extrusion temperature reached, the more serious the PCG structure was. The suitable annealing regime is 350°C/5h.

10.3233/atde240621

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First-Principles Study of Mechanical and Electronic Properties of η and η' Phases Present in 7xxx Alloys

The Physics of Metals and Metallography (2021)

Yunlong Ma Ben Lin Zhengbing Xiao Yuanchun Huang

Shear modulus

Structural Stability

Density of states

10.1134/s0031918x20140112

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Citations (2)