摘要
用透射电镜研究了 Ｔｉ细化 Ａ３５７铝合金组织中析出相的形态、组成及其对合金变形、性能的影响结果表明． Ｔｉ细化Ａ３５７铝合金组织中主要存在着弯曲状的 Ｔｉ_３Ｓｉ_５、直杆状的 ＴｉＡｌ_３及短棒状的以 Ａｌ和 Ｔｉ为主、含 Ｍｇ和 Ｓｉ的化合物拉伸变形过程中析出相阻挡和缠结位错，对合金有一定的强化作用时效过程中，析出相周围先形成表面无析出区，延长时效时间后该区消失。
The morphologies and compositions of precipitated phases in A357 Al alloy refined with Ti were measured by mean of TEM, and their effects on deformation and tensile properties of the alloy were also investigated. It was shown that these phases are Ti_3Si_5 with curve shape, TiAl_3 with straightpole-shape and short-stick--shape compound composed of Al, Ti, Mg and Si. During tensile deformation, the precipitated phases hold up and entwist dislocations, and strengthen the alloy. During aging treatment, free-precipitation zones around the above precipitated phases form first, and then disappear with increasing the aging time, which influences the tensile properties of the alloy.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期17-20,共4页
Acta Metallurgica Sinica
基金
航天预研基金
关键词
铝合金
析出相
拉伸性能
钛
晶粒细化
Ti, A357 Al alloy, precipitated phase, tensile property
