航空材料学报2016，Vol.36Issue(6)：29-34,6.DOI:10.11868/j.issn.1005-5053.2016.6.005
纯钛搅拌摩擦焊晶粒细化机制
Mechanism of Grain Refinement of Pure Titanium by Friction Stir Welding
摘要
Abstract
Reliable connection of 5 mm pure titanium was achieved by friction stir welding, and the microstructure of the welded joint was studied by optical microscopy( OM) , scanning electron microscopy( SEM) and transmission electron microscopy( TEM) . The re-sults show that the welded area can be divided into the weld nugget zone, thermo-mechanically affected zone, heat affected zone and base metal. According to the structure of each district, the dynamic recrystallization process of pure titanium during friction stir welding was analyzed. Because of high stacking fault energy, dislocations generated by friction stir of titanium cannot be completely decom-posed. When there is a hindrance, it can continue to move only through slip and climb. By the effect of friction stir repeatedly, the dislocation tangles are accumulated and piled up, so the dislocation density continuously increases, which will produce new grain boundaries and form fine grains, and then the grain refinement is achieved.关键词
纯钛/搅拌摩擦焊/动态再结晶Key words
pure titanium/friction stir welding/dynamic recrystallization分类
矿业与冶金引用本文复制引用
高福洋,郁炎,刘志颖,蒋鹏,郭宇凡..纯钛搅拌摩擦焊晶粒细化机制[J].航空材料学报,2016,36(6):29-34,6.基金项目
国家自然科学基金(U1404502) （U1404502）
