Lingying Ye
Central South University
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Featured researches published by Lingying Ye.
Materials Science and Technology | 2011
Lingying Ye; Xiaoyong Zhang; Yong Liu; Jinyuan Tang; Da-wei Zheng
Abstract A two-step overaging treatment was exploited in thermomechanical processing for producing fine grained Al–Mg–Li alloy sheets. The effects of each step and temperatures of overaging on the distribution of precipitates and recrystallised grain structure were investigated. The influence of preheating treatment before rolling on precipitate coarsening or dissolution was also considered. The results showed that, in contrast to rod shaped precipitates produced by single overaging at 300°C, precipitates produced by a two-step overaging tended to have globular morphologies. The globular precipitates were not deformed during the following large rolling reductions. Overaging at 200°C for 24 h then at 300°C for 24 h resulted in a distribution of globular precipitates with sizes of 1·0–1·2 μm. Preheating at 400°C or raising the overaging temperatures of each step to 300 and 400°C led to a reduction in the precipitate size. Subsequent rolling and recrystallisation resulted in a fine grain structure with an average grain diameter of approximately 8·1 μm for 200°C/24 h+300°C/24 h and 9·2 μm for 300°C/24 h+400°C/24 h overaging treated material respectively in the surface layers of the sheet.
Materials Science and Technology | 2011
Xiaoyong Zhang; Lingying Ye; Yong Liu; Jinyuan Tang; Da-wei Zheng
Abstract Grain refinement of Al–Mg–Li alloys for superplasticity prepared by thermomechanical processing has been a difficult task due to the cracking of these alloys when rolled at low temperatures. Raising the rolling temperature resulted in enhanced rollability of these sheets with no cracks but very coarse grains after recrystallisation. To solve this problem, a cross rolling schedule was developed to hinder fracture and simultaneously provide enough stored energy for following recrystallisaiton coupled by lowering the reheating temperature. Fine, equiaxed grains of ∼7 μm was achieved by this new approach and maximum total elongation of about 915% was obtained when deformed at a temperature of 525°C and an initial strain rate of 1×10−3 s−1.
Chinese Materials Conference | 2017
Lingying Ye; Wenqing Yang; Chuqi Jiang; Huaqiang Lin; Shengdan Liu; Jianguo Tang; Yunlai Deng; Xinming Zhang
The microstructures and stress corrosion behaviors of the welded joint in a MIG welded Al–Zn–Mg alloy were investigated by slow strain rate test and OM, EBSD, TEM observation. The results indicated that the stress corrosion cracking index of welded joint is bigger than the base metal, which means the stress corrosion resistance of base metal is better than MIG welded joint. The stress corrosion of MIG welded joints mainly occur in the weld zone and heat affected zone, which indicates that they are the weak areas of welded joints. The fracture mode of the joint in 3.5% NaCl solution are intergranular brittle fracture and partial transgranular dimple fracture, while that of base metal is only transgranular dimple fracture. The microstructure is coarse equiaxed grain in welded zone, and there is virtually no strengthening phase in this zone. In the fusion zone, fine columnar grains and equiaxed grains are distributed at different sides. There is the fibrous phase in the base metal, and the microstructure of heat affected zone is similar to this zone. But in the heat affected zone, recrystallization occurs and the grains grow obviously. And the strengthening phases in the quenching zone are completely dissolved, but their particles in over aged zone became coarseobviously.
Chinese Materials Conference | 2017
Lingying Ye; Xuebin Yao; Huaqiang Lin; Shengdan Liu; Yunlai Deng; Xinming Zhang
The correlation between chemical composition, multiphase microstructure and stress corrosion performance of Al–Zn–Mg alloy with different thickness coarse grain layers was studied by optical microscopy (OM), scanning electron microscope (SEM), transmission electron microscopy (TEM), tensile test and four point bending stress corrosion performance test. The results indicated that the thickness of coarse grain layer of three kinds of Al–Zn–Mg alloy profiles used in the test were about 200, 400 and 900 μm, while the stress corrosion cracking (SCC) resistance and strength of specimens with coarse grain layer decreased with increase of coarse grain layer thickness. Among different profiles, the stress corrosion cracking resistance of specimens with coarse grain layer and center layer without coarse grain layer exhibited the difference with the change of coarse grain thickness.
Journal of Alloys and Compounds | 2010
Wen-tao Wang; Xinming Zhang; Zhi-guo Gao; Y.L. Jia; Lingying Ye; Da-wei Zheng; Ling Liu
Journal of Alloys and Compounds | 2009
Lingying Ye; Xinming Zhang; Da-wei Zheng; Shengdan Liu; Jianguo Tang
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2016
Tao Xiao; Yunlai Deng; Lingying Ye; Huaqiang Lin; Chaojun Shan; Pengwei Qian
Journal of Central South University of Technology | 2008
Xinming Zhang; Lingying Ye; Ying-wei Liu; Yuxuan Du; Zhihui Luo
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2016
Shengdan Liu; Shaoling Wang; Lingying Ye; Yunlai Deng; Xinming Zhang
Journal of Central South University of Technology | 2010
Xinming Zhang; Da-wei Zheng; Lingying Ye; Jianguo Tang