异步轧制工业纯钛的组织与力学性能

采用异步轧制方式在室温下轧制TA1工业纯钛，获得平均晶粒尺寸小于300nm的超细晶组织，显著提升了材料的强度，并探讨了超细晶的形成和强化机制。经轧下量为87％的异步轧制后，材料内部形成均匀分布的狭长剪切带，组织中主要为等轴超细晶，亦存在少量拉长晶粒和小角度晶界；材料的显微硬度比原始热轧态提高了60％，抗拉强度提高至740MPa以上。

Microstructures and Mechanical Properties of Commercially Pure Ti Processed by Asymmetric Rolling

Commercially pure Ti （TAI） was asymmetrically rolled at room temperature. Ultrafinegrained Ti with grain size smaller than 300 nm was obtained and its strength was remarkably improved. The formation and strengthening mechanisms of the uhrafine grains were discussed. After asymmetric rolling with 87% reduction, narrow shear bands distributed uniformly in the materials. The roiled materials were mainly consisted of equiaxed uhrafine grains, and a small amount of elongated grains and small-angle grain boundaries were existed. The microhardness of the asymmetrically rolled Ti was enhanced about 60% and the ultimate tensile strength was above 740 MPa.