纳米晶、亚微米微晶2009铝合金塑性形变的波动特性

The Plastic Deformation Wave Propagation Property of Nanometer Crystalline and Sub-micro Crystalline 2009 Aluminum Alloy

纳米晶、亚微米微晶2009铝合金塑性形变试样上各点的应变量是不相同的，并且呈波动性变化，随着外加载荷的增加而波动的幅度增加，表明在拉伸过程中，其应力传播和剪切变形传播在三维方向都具有波动特性。形成峰值与材料缺陷造成应力集中有关，实验结果表明纳米晶、亚微米微晶2009铝合金材料的塑性变形的流动行为的波动特性和非均匀特性，证明了介观力学提出的观点。即材料进入塑性变形后，晶粒群将进入平移-转动涡流，将材料的初始结构层次（包括晶粒、晶界、晶群以及试样整体）全部纳入变形范畴。

The wave propagation feature of local area plastic deformation is observed not only in micro -scope, but also in meso-scope for the non-uniform multi-crystal metals. When the specimen of nanometer crystalline sub-micro crystalline 2009 aluminum alloy is in tension, deformations of different local areas in specimen are non-uniform and different from the macro-deformation of specimen in tension test. Strains of material are characterized by wave propagations, The wave peak value of plastic strain is caused by the materials defects. Test results give us a clear understanding of plastic deformation wave propagation property and non-uniform property in 2009 aluminum alloy. Demonstrate by the meso-mechanics theory when the metals materials go into plastic deformation,the crystalline grain groups shall go into moving evenly-turns the whirling fluid, By the initial structures of the materials （Consist of crystalline grain, Crystal boundary, grains group along with specimen entirety） Completely enter into deformed category.