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钛合金是世界上公认的难加工材料,但是利用超塑性成形/扩散连接工艺(SPF/DB)可以制作出用焊接、铆接工艺方法难于制作的复杂的钛合金飞机部件,并且使部件一体化、轻量化,成本降低。美国的飞机制造商于七十年代初期开始研究钛合金的超塑性成形工艺(SPF),他们在899～927℃的高温和变形速率为10~(_4)厘米/厘米·秒的条件下,使钛合金的延伸率达到600～1000％,试件成形过程就象塑料板真空成形一样,在不发生缩颈和断裂的情况下进行均匀的复杂变形。目前,美国已在四个机种上采用Ti-6Al-4V超塑性成形(SPF)零件,数量达到256
However, the use of superplastic forming / diffusion bonding (SPF / DB) makes it possible to produce complex titanium alloy aircraft parts that are difficult to manufacture by means of welding and riveting processes and to integrate the parts. Lightweight, cost reduction. Aircraft manufacturers in the United States started to study the superplastic forming process (SPF) of titanium alloys in the early 1970s under the conditions of a high temperature of 899 to 927 ° C and a deformation rate of 10 to (_4) cm / cmsec Titanium alloy elongation of 600 to 1000%, the specimen forming process is the same as the plastic sheet vacuum forming, without shrinkage and fracture in the case of uniform and complex deformation. At present, the United States has adopted Ti-6Al-4V superplastic forming (SPF) parts on four models in quantities up to 256