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在ECAP变形中,模具角度是影响材料组织与性能的重要因素。故本文分别采用通道夹角Φ=90°、外圆角Ψ=20°和通道夹角Φ=105°、外圆角Ψ=20°的模具,来探究模具角度对工业纯锆室温ECAP变形组织与性能的影响。通过金相、透射(TEM)、拉伸、扫描(SEM)、X射线衍射(XRD)等手段,分析在不同模具角度下,工业纯锆单道次ECAP变形组织与性能。实验结果表明:通道夹角Φ=90°和Φ=105°的金相组织对比,Φ=90°的晶粒破碎更为明显。同时,对比两者TEM结果,通道夹角Φ=90°的板条破碎明显,存在大量位错和位错缠结并伴有孪晶发生,故ECAP变形过程中通道夹角Φ=90°的变形大于通道夹角Φ=105°,细化效率高。拉伸和SEM结果表明缩小通道夹角,会提高材料的抗拉强度和硬度。XRD结果表明,模具角度对织构类型具有一定影响,在通道夹角Φ=90°的单道次ECAP变形中主要形成的是B织构和C1织构,而在通道夹角Φ=105°的单道次ECAP变形中形成的是主要B织构和C2织构,同时,两种变形条件下,织构极点扩展方向不同。
In the ECAP deformation, the mold angle is an important factor that affects the structure and properties of the material. In this paper, the mold angles of Φ = 90 °, φ = 105 °, φ = 105 ° and φ = And the impact of performance. The microstructure and properties of single pass pure ECAP ECAP under different mold angles were analyzed by means of metallographic, TEM, tensile, SEM and XRD. The experimental results show that the grain size of Φ = 90 ° is more obvious when the angle between the channels is Φ = 90 ° and Φ = 105 °. At the same time, comparing the TEM results of the two, the laths with the included angle of Φ = 90 ° are broken obviously, and there are a lot of dislocations and dislocations entangled with twins. Therefore, the angle between the channels is Φ = 90 ° during ECAP deformation Deformation greater than the angle between the channel Φ = 105 °, refinement efficiency. Tensile and SEM results show that narrowing the angle between the channels increases the tensile strength and hardness of the material. The XRD results show that the mold angle has an influence on the texture type. The B texture and the C1 texture are mainly formed in the single pass ECAP deformation with the angle φ = 90 °. When the included angle Φ = 105 ° Single-pass ECAP deformation is the formation of the main B texture and C2 texture, at the same time, the two deformation conditions, the extension direction of the different poles.