(河南科技大學(xué)材料科學(xué)與工程學(xué)院， 洛陽 471003)
摘 要: 用原子力顯微鏡對(duì)多晶體鈦拉伸塑性變形中表面褶皺的形成及單個(gè)晶粒的變形進(jìn)行了連續(xù)觀察和測(cè)量。結(jié)果表明， 表面褶皺隨著應(yīng)變量的增加而増大， 而凹凸的相對(duì)位置關(guān)系不隨變形的進(jìn)行而變化。 從單個(gè)晶粒來看應(yīng)變量在0.1附近時(shí)由于孿晶的形成產(chǎn)生了新的凹凸， 但對(duì)整體的表面褶皺凹凸位置關(guān)系沒有大的影響。表面平均粗糙度和表面最大高低差隨應(yīng)變量的增加近似呈直線性增大， 應(yīng)變量在0.1左右時(shí)由于孿晶的形成，使粗糙度有較明顯的增大。
關(guān)鍵字: 多晶體鈦； 拉伸變形； 表面形態(tài)； 滑移；孿晶； 原子力顯微鏡
uniaxial tension of polycrystalline titanium
（ Institute of Materials Science and Engineering,
Henan University of Science and Technology,
Luoyang 471003, China）
Abstract: Change in the surface morphology during tensile plastic deformation of polycrystalline titanium was consecutively observed and measured by the scanning probe microscope. The results show that the surface deformation is mainly due to slip for the plastic strain less than 0.1. Because a large amount of twins are formed and the second slip system becomes active, the surface roughness increases at the strain being 0.1 of the surface roughness-strain curve. The roughness, the maximum height difference, and the averaged slope angle of the microscope surface profile increase with the applied tensile strain.
Key words: polycrystalline titanium; tensile deformation; surface morphology; slip; twin; atomic force microscope
