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首页> 外文会议>Pacific Rim International Conference on Advanced Materials and Processing(PRICM 5) pt.1; 20041102-05; Beijing(CN) >Surface Roughness and Deformation of Grain during Tensile Plastic Deformation of Polycrystalline Titanium
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Surface Roughness and Deformation of Grain during Tensile Plastic Deformation of Polycrystalline Titanium

机译：多晶钛拉伸塑性变形过程中晶粒的表面粗糙度和形变

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摘要

The surface folds formed due to plastic deformation and the deformation behaviors of two kinds of polycrystalline titanium with grain sizes of about 30μm and 150μm respectively have been consecutively observed and measured by the scanning probe microscope. The results show that the surface folds in two kinds of specimens were increased with the increase of strain, but their relative position were kept unchanged during deformation. A large amount of twins were formed in each grain when the plastic strain reached about 0.1, which resulted in some new plastic folds. However, these new plastic folds had no influence on the positions of the plastic folds in both specimens as a whole. The roughness, the maximum height difference, and the averaged slope angle of the microscope surface profile increase with the applied tensile strain. But the surface roughness of the specimens with large grains are 1.4 to 4 times higher than that of the specimens with small grains. Two sudden changes in roughness could be observed in the specimens with large grains while the roughness in the specimens with small grains were kept smoothly increased. The influence of grain size on the plastic mechanism and surface roughness were discussed.
机译：通过扫描探针显微镜连续观察和测量了由塑性变形形成的表面褶皱和两种分别具有约30μm和150μm的晶粒尺寸的多晶钛的变形行为。结果表明，两种试样的表面褶皱随应变的增加而增加，但在变形过程中它们的相对位置保持不变。当塑性应变达到约0.1时，每个晶粒中会形成大量的孪晶，这会导致一些新的塑性褶皱。但是，这些新的塑料褶皱对整个两个样本中的塑料褶皱的位置均没有影响。显微镜表面轮廓的粗糙度，最大高度差和平均倾斜角随所施加的拉伸应变而增加。但是大晶粒试样的表面粗糙度是小晶粒试样的1.4至4倍。在晶粒大的试样中，可以观察到粗糙度的两个突然变化，而晶粒小的试样的粗糙度保持平稳地增加。讨论了晶粒尺寸对塑性机理和表面粗糙度的影响。

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