(西北工業(yè)大學(xué) 材料學(xué)院， 西安 710072)
摘 要: 研究了紫銅和黃銅攪拌摩擦焊接的可行性， 對焊接接頭的金相組織進(jìn)行了分析， 并通過拉伸實驗、 硬度分析、 彎曲實驗， 對接頭的性能進(jìn)行了驗證。 結(jié)果表明： 紫銅-黃銅具有良好的攪拌摩擦焊接性能， 可獲得與母材等強度的攪拌摩擦焊接接頭。 焊合區(qū)在熱力偶合作用下獲得動態(tài)再結(jié)晶組織， 接頭黃銅一側(cè)熱影響區(qū)沿厚度方向上下不同， 下側(cè)可分為再結(jié)晶區(qū)、 不完全再結(jié)晶區(qū)、 動態(tài)回復(fù)區(qū)； 上側(cè)出現(xiàn)明顯的偏析現(xiàn)象； 接頭紫銅一側(cè)熱影響區(qū)出現(xiàn)明顯的須狀組織， 并有晶粒微溶的跡象。
關(guān)鍵字: Cu； 攪拌摩擦焊； 金相組織； 力學(xué)性能
（ Institute of Materials, Northwestern Polytechnical University,
Xi'an 710072, China）
Abstract: The microstructures of the friction-stir welded joints of pure copper to brass and their performance are examined through tension, hardness and bending tests. The results show that the pure copper and brass can be friction stir welded and the welded joints have the same strength as the base material. The nugget zone has dynamic recrystallization microstructure under the thermo-mechanical effect. The microstructure of the heat-affected zone in the joint on the side of brass has some differences between the upside and underside. The latter can be divided into recrystallization zone, incomplete recrystallization zone and dynamic recovery zone, and the former is of apparent segregation. There are some streamline microstructures and a slight grain melting in the heat affected zone on the side of pure copper.
Key words: copper; friction-stir welding; microstructure; mechanical properties
