SPD技术对锆及锆合金力学行为影响研究现状

综述了锆及锆合金剧烈塑性变形(SPD)后性能变化的研究进展,系统阐述了锆及锆合金经剧烈塑性变形后显微硬度、拉伸/压缩性能、高低周疲劳性能,重点介绍了SPD技术在纯锆、Zr-Nb系合金中的应用。经过剧烈塑性变形后,锆及锆合金的抗拉强度及屈服强度均显著提升,但依据剧烈塑性成形轨迹、合金成分、第二相分布、热处理制度不同,其提升程度存在一定的差别。位错滑移是锆及锆合金高周疲劳的主要损伤机制,位错运动(包括位错滑移及位错攀移)是锆及锆合金低周疲劳的主要损伤机制。文章最后指出现阶段锆及锆合金SPD技术的发展趋势及应用前景。

Preparation Technology and Progress Analysis in the Global Three Major Titanium Dioxide Process by Hydrochloric Acid

The research progress of properties of zirconium and zirconium alloys after severe plastic deformation( SPD) was reviewed. The microhardness,tensile/compressive properties,high and low cycle fatigue properties of zirconium and zirconium alloys after severe plastic deformation were systematically described. The application of SPD technology in pure zirconium and Zr-Nb alloys was emphatically introduced. After severe plastic deformation,the tensile strength and yield strength of zirconium and zirconium alloys are significantly improved,but the degree of improvement is different according to different severe plastic forming trajectory,alloy composition,second phase distribution and heat treatment system. Dislocation slip is the main damage mechanism of high cycle fatigue of zirconium and its alloys,and dislocation movement( including dislocation slip and dislocation climb) is the main damage mechanism of low cycle fatigue of zirconium and its alloys. At last,the development trend and application prospect of SPD technology on zirconium and zirconium alloy are pointed out.