Effect of grain size and specimen dimensions on micro-forming of high purity aluminum

Xu, Jie; Zhu, Xiaoxin; Shan, Debin; Guo, Bin; Langdon, Terence G.

doi:10.1016/j.msea.2015.08.060

Cited by 57 publications

(23 citation statements)

References 68 publications

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“…Meanwhile, there is an obvious transition from nonuniform deformation to uniform deformation after micro-compression testing with decreasing of grain size as shown in Figure 8a-e. The nonuniform deformation can be improved significantly, and the compressed specimens using UFG pure Al are cylindrical with a smooth surface as shown in Figure 8d and e [77,78]. Research on the micro-extrusion of UFG aluminum showed that the material flow became more uniform because more grains were deformed during micro-extrusion [79].…”

Section: Potential Application In Micro-forming Technologymentioning

confidence: 99%

Innovative Applications of Ultrafine-Grained Materials

Xu¹,

Guo²,

Shan³

2017

Severe Plastic Deformation Techniques

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This chapter focuses on multifunctional properties of ultrafine-grained (UFG) metallic materials processed by severe plastic deformation (SPD), such as enhanced mechanical properties, excellent superplasticity, and wear resistance. Based on these multifunctional properties, the potential innovative application for UFG materials processed by SPD is introduced in the next section, including innovative application in micro-forming, nanoimplants, electro-connections, and sport engineering.

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Section: Potential Application In Micro-forming Technologymentioning

confidence: 99%

Innovative Applications of Ultrafine-Grained Materials

Xu¹,

Guo²,

Shan³

2017

Severe Plastic Deformation Techniques

Self Cite

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“…As such, it is critical to investigate the size effect on the deformation behavior of materials. Many scholars have conducted investigation on the size effect phenomenon, including grain size effect, specimen size effect, and feature size effect [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Hu et al [4] found that grain size and laser spot had a considerable effect on the indentation depth under laser shock processing. Through micro-compression experiments of high purity aluminum, Xu et al [5] investigated the coarse-grained and ultrafine-grained effect on flow stress. Wang et al [6] established a finite element model to study the grain size effect on the deformation behavior of metal foils under the laser flexible micro bending process.…”

Section: Introductionmentioning

confidence: 99%

Feature Size Effect on Formability of Multilayer Metal Composite Sheets under Microscale Laser Flexible Forming

Liu

Zhang

Gau

et al. 2017

Metals

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Abstract:Multilayer metal composite sheets possess superior properties to monolithic metal sheets, and formability is different from monolithic metal sheets. In this research, the feature size effect on formability of multilayer metal composite sheets under microscale laser flexible forming was studied by experiment. Two-layer copper/nickel composite sheets were selected as experimental materials. Five types of micro molds with different diameters were utilized. The formability of materials was evaluated by forming depth, thickness thinning, surface quality, and micro-hardness distribution. The research results showed that the formability of two-layer copper/nickel composite sheets was strongly influenced by feature size. With feature size increasing, the effect of layer stacking sequence on forming depth, thickness thinning ratio, and surface roughness became increasingly larger. However, the normalized forming depth, thickness thinning ratio, surface roughness, and micro-hardness of the formed components under the same layer stacking sequence first increased and then decreased with increasing feature size. The deformation behavior of copper/nickel composite sheets was determined by the external layer. The deformation extent was larger when the copper layer was set as the external layer.

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“…This phenomenon has been validated by Echenhualler et al [10] in the upsetting tests at an elevated temperature by using micro specimens of CuZn15 and stainless steel. An alternative approach to reduce the influence of size effects is to refine grain size within the deformed part, which has been investigated by a large number of researchers [7,11,12].…”

Section: Introductionmentioning

confidence: 99%

Influences of temperature and grain size on the material deformability in microforming process

Jiang

Zhao

et al. 2016

Int J Mater Form

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This paper investigated the influences of temperature and grain size on the deformability of pure copper in micro compression process. Based on the dislocation theory, a constitutive model was proposed taking into account the influences of forming temperature, Hall-Petch relationship and surface layer model. Vacuum heat treatment was employed to obtain various grain sizes of cylindrical workpieces, and then laser heating method was applied to heat workpieces during microforming process. Finite element (FE) simulation was also performed, with simulated values agreed well with the experimental results in terms of metal flow stress. Both the FE simulated and experimental results indicate that forming temperature and grain size have a significant influence on the accuracy of the produced product shape and metal flow behaviour in microforming due to the inhomogeneity within the deformed material. The mechanical behaviour of the material is found to be more sensitive to forming temperature when the workpieces are constituted of fine grains. experimental results indicate that forming temperature and grain size have a significant influence on the accuracy of the produced product shape and metal flow behaviour in microforming due to the inhomogeneity within the deformed material. The mechanical behaviour of the material is found to be more sensitive to forming temperature when the workpieces are constituted of fine grains.

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Effect of grain size and specimen dimensions on micro-forming of high purity aluminum

Cited by 57 publications

References 68 publications

Innovative Applications of Ultrafine-Grained Materials

Innovative Applications of Ultrafine-Grained Materials

Feature Size Effect on Formability of Multilayer Metal Composite Sheets under Microscale Laser Flexible Forming

Influences of temperature and grain size on the material deformability in microforming process

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