Microstructure and mechanical property characterizations of metal foil after microscale laser dynamic forming

This article discusses the feasibility of a new microforming technique—laser dynamic forming (LDF). LDF is a new hybrid forming process, combining the advantages of laser shock peening, and metal forming, with an ultra high strain rate forming utilizing laser shock waves. Experiments are conducted on copper foils to demonstrate this forming process. After the forming process, the mechanical and microstructure of the formed work piece will be characterized. Electron backscatter diffraction will be used to investigate the grain microstructure and misorientations quantitatively. The residual stress distributions will be measured using x-ray diffraction. The key factors for the improved formability of this high strain rate microforming process will be discussed in detail. With further development, LDF may become an important microforming technology for various materials.

[1]  Glenn S. Daehn,et al.  Effect of velocity on flow localization in tension , 1996 .

[2]  V. Novikov.  Grain growth and control of microstructure and texture in polycrystalline materials , 1997 .

[3]  D. Bahr,et al.  Non-linear deformation mechanisms during nanoindentation , 1998 .

[4]  Subra Suresh,et al.  DETERMINATION OF ELASTOPLASTIC PROPERTIES BY INSTRUMENTED SHARP INDENTATION , 1999 .

[5]  Dong-Woo Cho,et al.  3D Ball-End Milling Force Model Using Instantaneous Cutting Force Coefficients , 2005 .

[6]  F. Hauser,et al.  Deformation and Fracture Mechanics of Engineering Materials , 1976 .

[7]  Jiang Zhe,et al.  Experimental study and computer simulation of fracture toughness of sheet metal after laser forming , 2005 .

[8]  Viggo Tvergaard,et al.  Analyses of Plastic Flow Localization in Metals , 1992 .

[9]  Y. Saotome,et al.  Microforming of Mems Parts with Amorphous Alloys , 1998 .

[10]  Subra Suresh,et al.  A new method for estimating residual stresses by instrumented sharp indentation , 1998 .

[11]  Sinisa Vukelic,et al.  Wave-solid interactions in laser-shock-induced deformation processes , 2005 .

[12]  R. Colton,et al.  Nanoindentation studies of yield point phenomena on gold single crystals , 1996 .

[13]  The Response of Single Crystal and Polycrystal Nickel to Quasistatic and Shock Deformation , 1991 .

[14]  V. S. Balanethiram,et al.  Enhanced formability of interstitial free iron at high strain rates , 1992 .

[15]  Zhou Zhimin,et al.  An evolution model of dislocation patterning for creep and its computer simulation , 1994 .

[16]  Mukul Kumar,et al.  Electron Backscatter Diffraction in Materials Science , 2000 .

[17]  Pol Duwez,et al.  The Propagation of Plastic Deformation in Solids , 1950 .

[18]  Glenn S. Daehn,et al.  Increased ductility in high velocity electromagnetic ring expansion , 1996 .

[19]  Gary J. Cheng,et al.  Dislocation behavior in silicon crystal induced by laser shock peening: A multiscale simulation approach , 2005 .