美国 Raychem 公司研制成功了一种“忆形”合金管接头,用以快速联接金属管道。所用的“忆形”合金称为“Be-talloy”,管接头制成时为奥氏体相,经过快速低温冷却,使其变为马氏体相,然后用机械方法使其塑性变形(膨胀),由于这种合金有“记忆”原有形状的特性,将其加热到一定温度,就会收缩并恢复到原有形状。据报道,用这种管接头联接管子时,工艺十分简单,只要把它套到管子的接头上,用喷枪加热,使其收缩,就能产生高达2800kgf/cm~2的箍紧力。管接头收缩时,它的起粘结作用的内衬就会紧密地粘结 The United States Raychem company successfully developed a “memory-shaped” alloy pipe fittings, used to quickly connect the metal pipe. The “memorial” alloy used is called “Be-talloy”. The joint is made of an austenitic phase, which is rapidly cooled to a martensitic phase and then mechanically deformed (expanded ), Because of this alloy “memory” the original shape of the characteristics, will be heated to a certain temperature, it will shrink and restore to its original shape. It has been reported that when the pipe is connected with the pipe joint, the process is very simple. The pipe can be set to the pipe joint by heating it with a torch and shrinking it to produce a tightening force of up to 2800 kgf / cm 2. When the coupling shrinks, its adhesive lining will bond tightly