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Effects of grain size on shift of neutral layer of AZ31 magnesium alloy under warm condition

Transactions of Nonferrous Metals Society of China 2015年第3期25卷 732-737页

作者：黄光胜王艳霞王利飞韩廷状潘复生重庆大学材料科学与工程学院重庆400045 重庆大学国家镁合金材料工程技术研究中心重庆400044 重庆科学技术研究院重庆先进材料研究中心重庆401123

The effects of grain size on the shift of neutral layer of AZ31 magnesium alloy sheets with different grain sizes ranging from 12.1 to 34.7μm were investigated by the 90° V-bending tests at 150 °C. The results show that the neutral layer tends to shift to outer region of the sheets and the coefficient of neutral layer value (k-value) increases with the increasing grain size. This phenomenon is mainly owing to the enhanced asymmetry between the outer tension region and inner compression region with the increase of grain size. Twinning dominates the deformation in inner region while slips dominate the deformation in outer region.

关键词： AZ31 magnesium alloy grain size V-bending neutral layer asymmetry

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Development of the Convective Boundary layer Capping with a Thick neutral layer in Badanjilin:Observations and Simulations

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Advances in Atmospheric Sciences 2012年第1期29卷 177-192页

作者： HAN Bo LÜShihua AO Yinhuan Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of SciencesNo.320Donggang West RoadLanzhou 730000

In this study, the development of a convective boundary layer （CBL） in the Badaujilin region was investigated by comparing the observation data of two cases. A deep neutral layer capped a CBL that occurred on 30 August 2009. This case was divided into five sublayers from the surface to higher atmospheric elevations： surface layer, mixed layer, inversion layer, neutral layer, and sub-inversion layer. The development process of the CBL was divided into three stages： S1, S2, and S3. This case was quite different from the development of the three-layer CBL observed on 31 August 2009 because the mixed layer of the five-layer CBL （CBL5） eroded the neutral layer during S2. The specific initial structure of the CBL5 was correlated to the synoptic background of atmosphere during nighttime. The three-stage development process of the CBL5 was confirmed by six simulations using National Center for Atmospheric Research （USA） large-eddy simulation （NCAR-LES）, and some of its characteristics are presented in detail.

关键词： convective boundary layer neutral layer large-scale circulation large-eddy simulation

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Crimp feasibility of AZ31 magnesium alloy wide plate at warm temperatures responding to asymmetry

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Journal of Magnesium and Alloys 2022年第3期10卷 862-876页

作者： Fangkun Ning Qichi Le Jiashi Yan Yonghui Jia Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The crimp feasibility of AZ31 Mg alloy wide plate responding to asymmetry and anisotropy at different temperatures was conducted by bending experiments and numerical *** the microstructural characteristic,mechanical properties,EBSD and FEM analysis,the results indicated that{10-12}twins and pyramidal(a)slip were dominated at the inner surface layer of the plate,while prismatic and pyramidal(a)slips were controlled at the outer layer when bending at 100℃,and their quantity decreased as the temperature elevation and vanished at 200℃.The flexural deflection increased gradually with the augment of flexural temperature,while the fracture stress weakened.A large number of twins nucleated and grew in the coarse grain,causing major distribution proportion of high angular grain boundaries(HAGBs)at the compression part,which could improve its flexural properties and affect subsequent strain contours,twins and recrystallization *** offset of the neutral layer declined from 1.4125 mm to 0.7261 mm with the temperature rising from 100℃to 250℃when bending,while it was concentrated on 0.0338-0.0481 mm when coiling,accounting for 0.26%-0.37%of the plate *** last,the reel diameter descended with increasing the temperature and coiling rate.

关键词： Plate coiling Flexural deflection Fracture stress neutral layer Schmid factor.

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