Columnar crystal CuAlBe shape memory alloy tube by 0.4%Be was produced by heated mold continuous casting process

then the tube was cut into segments

after solution treatment and diameter expansion

the pipe joint was completed.With continuous casting speed at 80mm/min

cooling distance at 10 mm

pressure head at 20 mm and the mould temperature at 1 050℃

the continuous casting memory alloy tube exhibits very stable with desirable surface quality and size precision.The maximal expanding ratio of the coupler can reach 10.20%

and the shape recovery rate can reach 92.86%.When nominal expanding ratio is 7.55%

the Asand Aftemperature are increased

and Msand Mftemperature are decreased after diameter expansion.In addition

transformation hysteresis temperature range of the alloy is increased from 40℃before diameter expansion to 70℃.