Huan Zhao

Max-Planck-Institut für Nachhaltige Materialien

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Baptiste Gault

Max-Planck-Institut für Nachhaltige Materialien

Dierk Raabe

Max-Planck-Institut für Nachhaltige Materialien

Dirk Ponge

Max-Planck-Institut für Nachhaltige Materialien

Frédéric De Geuser

Science et Ingénierie des Matériaux et Procédés

Dan Hu

Wuhan Institute of Technology

Hao Gao

Tianjin University

Guodong Chen

Shandong Jiaotong University

Liang‐Dong Guo

Institute of Microbiology

Xin‐Sheng Yao

Jinan University

Alisson Kwiatkowski da Silva

Max-Planck-Institut für Nachhaltige Materialien

Cooperative Institutions

Max-Planck-Institut für Nachhaltige Materialien

Max Planck Society

Chinese Academy of Sciences

Central South University

Jiangsu University

University of Chinese Academy of Sciences

University of Science and Technology Beijing

Tsinghua University

Chongqing University

RWTH Aachen University

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Effects of aging treatment on microstructure and mechanical properties of non-equiatomic high entropy alloy

Intermetallics (2022)

Ziyi Zhou G.R. Li H.M. Wang Pengjie Zhou Kai Dong

Vickers hardness test

High-Entropy Alloys

Hardening (computing)

10.1016/j.intermet.2022.107799

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Citations (7)

Combined Developmental Toxicity Of Cyhalofop-butyl And Quizalofop-p-ethyl On The Zebrafish (Danio rerio) Embryos

Research Square (Research Square) (2022)

Li Liu Dongmei Wang Ping Li Huan Zhao

Abstract Aryloxyphenoxypropionate herbicides have the characteristics of high efficiency, low toxicity, and safety to subsequent crops, and occupy an important position in the world herbicide market. Cyhalofop-butyl and quizalofop-p-ethyl are two representative herbicides, which are widely used in weed control. However, there is limited information on their combined toxicity to aquatic organisms. In this study, the developmental toxicity of cyhalofop-butyl and quizalofop-p-ethyl exposure in combination on zebrafish embryos was valuated to better understand the interaction between the that. The 96 h-LC 50 (50% lethal concentration) of cyhalofop-butyl and quizalofop-p-ethyl on zebrafish embryos were 0.637 mg·L − 1 and 0.248 mg·L − 1 , respectively. The combined effect of cyhalofop-butyl and quizalofop-p-ethyl was an antagonistic effect, and the 96 h-LC 50 of zebrafish embryos was 1.043 mg·L − 1 . Morphologically distinct pericardial edema and yolk cysts were observed after combined exposure, with significant effects on body length and heart rate in zebrafish embryos. At the same time, the mRNA levels of gene related to apoptosis and cardiac development also changed significantly. Therefore, we speculate that changes in genes related to apoptosis and cardiac development should be responsible for the abnormal development during embryonic development following co-exposure of cyhalofop-butyl and quizalofop-p-ethyl.

Danio

Developmental toxicity

10.21203/rs.3.rs-2131712/v1

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Segregation assisted grain boundary precipitation in a model Al–Zn–Mg–Cu alloy

Huan Zhao Frédéric De Geuser Alisson Kwiatkowski da Silva Agnieszka Szczepaniak Baptiste Gault

Abstract Understanding the composition evolution of grain boundaries and grain boundary precipitation at near-atomic scale in aluminum alloys is crucial to tailor mechanical properties and to increase resistance to corrosion and stress corrosion cracking. Here, we elucidate the sequence of precipitation on grain boundaries in comparison to the bulk in a model Al-Zn-Mg-Cu alloy. We investigate the material from the solution heat treated state (475 °C), through the very early stages of aging to the peak aged state at 120 °C and further into the overaged regime at 180 °C. The process starts with solute enrichment on grain boundaries due to equilibrium segregation accompanied by solute depletion in their vicinity, the formation of Guinier–Preston (GP) zones in the solute-enriched grain boundary regions, and GP zones growth and transformation. The equilibrium segregation of solutes to grain boundaries during aging accelerates this sequence compared to the bulk. Analysis of the ∼10 nm wide precipitate-free zones (PFZs) adjacent to the solute-enriched grain boundaries shows that the depletion zones are determined by (i) interface equilibrium segregation; (ii) formation and coarsening of the grain boundary precipitates and (iii) the diffusion range of solutes in the matrix. In addition, we quantify the difference in kinetics between grain boundary and bulk precipitation. The precipitation kinetics, as observed in terms of volume fraction, average radius, and number density, is almost identical next to the depletion zone in the bulk and far inside the bulk grain remote from any grain boundary influence. This observation shows that the region influenced by the grain boundaries does not extend beyond the PFZs.

Grain boundary strengthening

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Citations (2)

Atom probe tomography for studying the interplay of segregation and phase transformations

Baptiste Gault Alisson Kwiatkowski da Silva Huan Zhao Dirk Ponge Dierk Raabe

Atom probe

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Textures Studied at Near Atomic-Scale

Dierk Raabe Baptiste Gault Andrew Breen Mengji Yao Huan Zhao

Source

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Numerical Simulation Study on Directional Solidification of DD5 Nickel-Based Single-Crystal Turbine Blades

Crystals (2024)

Jianhui Wei Lü Min Libo Pi Huan Zhao Qian Lei

Two models with a wax module tree structure were employed for directional solidification simulation. An experimental alloy of a second-generation nickel-based single-crystal superalloy, DD5, was set for this investigation. The temperature gradient value of the conventional model at 80 mm and 160 mm was less than 3.8 K/mm, and the temperature gradient value of the new model structure at the same height could reach more than 5.0 K/mm. The paste–liquid interface paste zone of the new model structure in the directional solidification process was narrower. The solidification interface was more stable than that of the conventional model. The declination angle between the primary dendrite and the principal stress axis was smaller, and the average crystal orientation was about 6.0°. Under the new model, the integrity of the single crystal of the edge plate was good, and no heterocrystalline defects were formed. At the sharp corner of the end face of the edge plate, the solidified dendrites grew staggered, which hindered the effective contraction of other parts of the edge plate and produced micro-looseness. The whole simulation was in line with the test results.

Directional solidification

10.3390/cryst15010042

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The effect of shearable clusters and precipitates on dynamic recovery of Al alloys

Acta Materialia (2023)

Yixin Wang Huan Zhao Xinren Chen Baptiste Gault Yves Bréchet

The formability of Al alloys is strongly influenced by their strain hardening capacity. Whilst the effect of precipitates on yield strength has been thoroughly studied, their effects on the strain hardening behaviour have been comparatively less studied. This is especially true for the case of shearable particles, such as those formed during natural aging, or underaging. This work presents a detailed study of the effect of shearable clusters/precipitates on the room temperature dynamic recovery of 7xxx Al alloys. The dynamic recovery behaviour is characterised by the slope of the stage III hardening (β) curve in a Kocks-Mecking plot, and the cluster/precipitate state has been characterised using small angle x-ray scattering and atom probe tomography. The rate of dynamic recovery is shown to depend non-monotonically on the yield strength of the alloy. For alloys in the solution treated and quenched state, or with an extremely fine distribution of clusters, dynamic recovery becomes more difficult with increasing alloy yield strength. However, as the cluster/particle spacing increases, such as during artificial aging, dynamic recovery becomes easier. A phenomenological model is presented showing that the critical microstructural features controlling this non-monotonic dependence of dynamic recovery on yield strength is the ratio of the cluster/precipitate spacing and the critical annihilation distance between dynamically recovering dislocations. The model is general and describes well the experimental data. It can be used as a predictive tool to guide microstructure design for combinations of yield strength and strain hardening behaviour.

Hardening (computing)

Strain hardening exponent

Work hardening

10.1016/j.actamat.2023.119643

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Citations (19)

Effect of cluster chemistry on the strengthening of Al alloys

Acta Materialia (2024)

Yixin Wang Xinren Chen Huan Zhao Wenwen Sun Qi Zhang

When a supersaturated Al solid solution is held at room temperature, natural ageing occurs through the formation of clusters/zones providing a strengthening of the material. Recently, it was shown that this process can be greatly amplified by applying a cyclic plastic strain to a supersatured Al alloy. The cyclic strengthening also leads to a microstructure dominated by clusters/zones but the strengths are much higher than those obtained by natural aging, and can even exceed the peak aged strength. This work uses a combination of atom probe tomography and small angle x-ray scattering to provide a quantitative comparison of the cluster states in commercial Al alloys AA2024 and AA7075, after both natural aging and cyclic strengthening. We show that the chemistry of the clusters formed by these processes is different, and the clusters formed by cyclic strengthening tend to have chemistries closer to the composition of the relevant local equilibrium precipitate. The average force required to shear an individual cluster/zone is back-calculated from the strengthening observed experimentally and a strong correlation is found between the shearing force and the solute content of the cluster (i.e. 1-XAl, where XAl is the Al content of the cluster). This correlation applies not only for AA2024 and AA7075, but also AA6111 and AA7050 data taken from the literature, as well as some precipitates formed at elevated temperatures. This work shows that the first order effect controlling cluster strengthening is simply the cluster chemistry and its proportional effect on the force required to shear a cluster.

Shearing (physics)

Supersaturation

Atom probe

Solid solution strengthening

10.1016/j.actamat.2024.119809

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Citations (4)

CCDC 1508935: Experimental Crystal Structure Determination

The Cambridge Structural Database (2017)

Huan Zhao Guodong Chen Jian Zou Rong‐Rong He Sheng-Ying Qin

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc1mn5bs

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CCDC 2062980: Experimental Crystal Structure Determination

The Cambridge Structural Database (2021)

Huan Zhao Jian Zou Wei Xu Dan Hu Liang‐Dong Guo

10.5517/ccdc.csd.cc277pry

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