论文部分内容阅读
研究了具有Co-20Ti成分的L12-Co3Ti金属间化合物的硬度随时效时间的变化,同时测定了时效处理后含析出相的L12-Co3Ti金属间化合物的屈服强度随温度的变化.通过透射电镜观察揭示出由于析出相为单纯的面心立方结构的γ-Co相,虽然硬度低于基体的Co3Ti金属间化合物,仍然可使Co3Ti相得到有效硬化.γ-Co析出相在时效初期与Co3Ti基体保持共格关系.γ-Co析出相呈片状形态,平行于有序基体的{100}晶面析出.透射电镜观察结果表明,γ-Co析出相与变形位错的交互作用为引力型交互作用,这种引力型交互作用对材料的强化起了主要贡献.同时还讨论了由于软析出相而引起的强化机理.
The hardness of L12-Co3Ti intermetallic compound with Co-20Ti composition changes with the aging time and the change of yield strength of the precipitated L12-Co3Ti intermetallic compound with temperature after the aging treatment was also studied.The results of transmission electron microscopy It is shown that the Co3Ti phase can be effectively hardened due to the lower hardness than the matrix Co3Ti intermetallic compound due to the precipitated phase as a simple face-centered cubic γ-Co phase. The γ-Co precipitates are retained in the initial stage of aging with the Co3Ti matrix Coherent relationship between the γ-Co precipitated phase flaky morphology, parallel to the ordered matrix {100} crystal surface precipitation observed by transmission electron microscopy, γ-Co precipitation phase and the deformation of the interaction of dislocation gravitational interaction This gravitational interaction plays a major role in strengthening the material, and the strengthening mechanism due to the soft precipitated phase is also discussed.