Numerical research on mechanical behavior and properties of 3-dimensional pure nanocrystalline Ni and α-Fe bulks
Combining embedded atom potential with molecular dynamics method, a numerical model for mechanical behavior and deformation of 3-dimensional infinite pure nanocrystalline metal bulk was proposed and then the deformation process of face-centered cubic Ni and body-centered cubic α-Fe nano bulks under tensile and shearing load were studied. Simulation reveals that the tensile yielding and fracture strength of Ni nanobulk are 13.67GPa and 19.98GPa, elastic modulus is 122.03GPa, and shearing strength and shearing modulus are 16.67GPa and 101.15GPa, and that for BCC α-Fe bulk, the corresponding data are 4.49GPa, 9.25GPa, 66.03GPa, 16.39GPa and 92.43GPa respectively. Tensile failure of Ni bulk results from lattice slide, and there is a short-ime yield period during which the elastic modulus falls rapidly, comparatively the tensile failure of α-Fe nano bulk results from internal atom stack, and a long time yield period comes out. Mechanical properties and deformation mechanism of 3-D nanocrystalline metal bulk revealed in the presented paper keep accordance with experimental results.
nanocrystalline metal mechanical properties numerical simulation deformation mechanism
黄丹 章青 郭乙木
河海大学工程力学系,江苏南京 210098 浙江大学固体力学研究所,浙江杭州 310027
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）