稀土高强铝锂合金力学性能及微观变形行为

在 2 0 90铝锂合金和添加微量稀土铈的 2 0 90铝锂合金 (2 0 90 +Ce)的拉伸性能测试的基础上 ,利用TEM技术对拉伸试样中位错组态进行了观察 ,探讨宏观力学性能与微观变形行为间的联系。结果表明 ,2 0 90 +Ce铝锂合金仍表现出较明显的共面滑移特征 ,所不同的是其滑移带比较细密均匀 ,并且具有交滑移特征 ;而不含稀土的普通 2 0 90铝锂合金中共面滑移带较粗 ,且带与带间距宽 ;弱束暗场观察发现 ,2 0 90 +Ce铝锂合金中某些大角度晶界上及附近存在较强的应变衬度 ,这说明该合金仍存在较强的局域应变倾向

The micro-deformation behaviors of containing rare earth high-strength Al-Li alloy

Based on the tensile performance of aluminium lithium alloys 2090 and rare earth high strength aluminium lithium alloy (2090+Ce, add trace addition of cerium to the alloy 2090), the dislocation microstructures in the tensile samples of two alloys were investigated by means of TEM technique in order to understand the relationship between macro properties and micro deformation. The observations show that there still obviously exists characteristics of co planar slippage in the alloy 2090+Ce, however its slipping strip is relatively dense and uniform by comparison with common industrials aluminium lithium alloy 2090. The rather stronger strain contrasts has been found in the vicinity of some big angle grain boundary in the alloy 2090+Ce by weak beam dark field image, which manifested that the tendencies of local strain in this alloy is relatively stronger.