The Influence of Inhomogeneous Deformation on the Microstructures and Properties of Thick-Plate 7150 Alloy

Zhao, Feng; Cao, Ling Yong; Lang, Yu Jing; Cui, Hua; Zhuang, Lin Zhong; Zhang, Ji Shan

doi:10.4028/www.scientific.net/MSF.749.250

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HomeMaterials Science ForumMaterials Performance, Modeling and SimulationThe Influence of Inhomogeneous Deformation on the...

The Influence of Inhomogeneous Deformation on the Microstructures and Properties of Thick-Plate 7150 Alloy

Abstract:

The diversities and relations of microstructures and properties between the center and surface layer in thick-plate 7150 alloy were investigated by means of OM, TEM, SEM and tensile tests. The results indicated that the average width of elongated grains with fewer substructures in the center of hot-rolling thick plate is about 2 times larger than that in the surface layer. The coarser second phases are massed up at the grain boundaries of the center layer while those are crushed into smaller particles in the surface layer. By aging, the strengthening precipitates in the center are mainly GP zone and η' phase, while in the surface layer η' and η phases play the main roles. Consequently, the strength is about 80Mpa (15%) higher in the center than in the surface, with lower elongations (26% lower).

Info:

Periodical:

Materials Science Forum (Volume 749)

Main Theme:

Materials Performance, Modeling and Simulation

Edited by:

Yafang Han, Xuefeng Liu and Guanghong Lv

Pages:

250-254

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.749.250

Citation:

F. Zhao et al., "The Influence of Inhomogeneous Deformation on the Microstructures and Properties of Thick-Plate 7150 Alloy", Materials Science Forum, Vol. 749, pp. 250-254, 2013

Online since:

March 2013

Authors:

Feng Zhao, Ling Yong Cao, Yu Jing Lang, Hua Cui, Lin Zhong Zhuang, Ji Shan Zhang

Keywords:

Aluminium Alloy, Deformation, Precipitate, Property, Thick-Plate

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Paper TitlePages

Tensile Behavior of Mg-Nd-Zn-Zr Alloy at Medium and High Temperature

Authors: W.H. Wang, D. Wu, Rong Shi Chen, Chang Sheng Lou

Abstract: The tensile deformation behavior and microstructure evolution of Mg-Nd-Zn-Zr alloys at solid solution condition was studied during the tensile tested at medium and high temperature. The result showed that, in medium temperature range (≤250^οC), serrated flow was observed. With the temperature increasing, the critical strain decreased, the serration became more intensive, and the type of serration changed from type A to type A+B, finally to type B. At temperature of 250 ^οC, where serrated flows become most obvious, a large number of precipitated phases in slip band were found in micrographs. The strength reached a high peak and the ductility stay at low ebb in mechanical perspective. When tensile tested at high temperature ranging from 300 ^οC to 400^οC, serrated flow disappeared and the ductility increased profoundly with the temperature increasing, and then approached to super-plasticity. In addition, the deformation mechanism, at medium and high temperature, has been discussed by calculating the activation energy.

362

Gradient Nano-Grained Cu and Cu-Zn Alloys Processed by Surface Mechanical Attrition Treatment

Authors: Zhe Yin, Le Le Sun, Yu Shen, Yan Zhao Pang, Jian Yang, Yu Lan Gong, Jing Mei Tao, Xin Kun Zhu

Abstract: Cu and Cu-30wt.%Zn alloys with stacking fault energies (SFEs) of 78 mJ/m² and 14 mJ/m² were processed by surface mechanical attrition treatment (SMAT) at room temperature and liquid nitrogen (LN) temperature, respectively. The effect of SFE and deformation temperature on tensile properties of these samples was investigated. The tensile testing results indicated that the yield strength and uniform elongation of these samples enhanced simultaneously with decreasing SFE. Meanwhile, the LN-SMAT processed samples exhibited remarkably higher strength and slightly lower ductility compared to those processed at room temperature. The SFE affected the deformation mechanisms of metals greatly. X-ray diffraction (XRD) measurements indicated that the twin density increased while the average grain size decreased with SFE decreasing, and twinning became the dominant deformation mechanism. The relationship between microstructure and mechanical property is also discussed.

580

Friction Stir Processing at High Rotation Rates of a Magnesium Alloy: Mechanical Properties at High Temperatures and Microstructure

Authors: Emanuela Cerri, Gilda Renna, Marcello Cabibbo, Michela Simoncini, Archimede Forcellese

Abstract: A high-pressure die-cast magnesium alloy plate was friction stir processed at high rotation rates with different advancing speeds. The stirred zone was very narrow around the tool and this made the friction stir process difficult to occur in the whole thickness of the plate. Intermetallic-phase network at grain boundaries was refined due to partial dissolution and fragmentation of Mg₁₇Al₁₂ β-phase during the friction stir process; the likely increment of solute content in solid solution was exploited for aging to improve hardness. The ductility of friction stir processed samples deformed at 300° and 350°C substantially increased compared to the base material and to room temperature strained samples.

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