作　　者： ; ;

机构地区： 广东工业大学机电工程学院机械电子工程系

出　　处： 《功能材料》 2000年第6期605-607,共3页

摘　　要： 用热型连铸法从金属液直接成形制取直径1.5mm CuAlNi合金丝。将铸型温度设定为1110℃,可以拉铸出表面光洁、内部含有几个平行晶粒的定向凝固合金丝。拉铸速度50mm/min时,晶粒数较少,晶界平直;拉铸速度80mm/min时,晶粒数较多,晶界较曲折。试样经1000℃固溶处理后,拉伸强度达502N/mm2,延伸率14.4%,其中塑性应变8%。在4%固定应变下,反复拉伸的疲劳断裂次数高达706次,比文献所列单晶的断裂次数提高44%。热型连铸法制取铜基形状记忆合金,既可免除塑性加工的困难,又可获得定向凝固组织,提高合金性能,具有巨大的优越性。 CuAlNi alloy wires 1.5mm in diameter were cast with the heated mold continuous casting process. Smooth surface w ires with unidirectional structure containing a few parallel arranged c rystals were obtained with a mold temperature setting of 1110℃. When cast speed was set at 50mm/min, the number of crystal was fewer, an d the grain boundaries were straight, while at 80mm/min, the number o f crystal was more, the grain boundaries became tortuous. After 1000℃ solid solution, the wires showed a tensile strength of 502N/mm2, el ongation 14.4%,among which plastic strain of 8% included. Under 4% stra in, the repeat tensile fatigue rupture was as high as 706 circles, 4 4% higher than that of single crystal specimen reported in the literat ure. The heated mold continuous casting process showed great advantage s in producing Cu-base shape memory alloys owing to the removing of difficult plastic forming while obtaining unidirectional structure to i mprove the performance of the alloys.

关 键 词： 热型连铸 单晶 形状记忆合金

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺] [一般工业技术]