构建多尺度晶粒结构增强钛的强度和延展性

Simultaneously Enhancing Strength and Ductility of Titanium via Multimodal Grain Structure

本文利用低温冷轧和低温退火,成功制备了具有多尺度晶粒结构的商用钛。多尺度晶粒结构钛具有926MPa屈服强度,均匀伸长率为11%,拉伸断裂伸长率为23%。多尺度晶粒结构钛强度的提高主要是因为存在超细等轴晶粒,而延展性的提高主要是因为存在大量的大角晶界(HAGBs)和多尺度晶粒结构。

Commercial Ti with a multimodal grain structure is successfully produced by using cryorolling,followed by low temperature annealing.The multimodal grain structure Ti shows coexisting high yield strength of 926MPa,uniform elongation of 11%and failure elongation of 23%.The strength enhancement is mainly derived from the ultrafine equiaxed grains while the improved ductility is originated from the large fraction of high angle grain boundaries(HAGBs)and the multimodal grain structure.