公开(公告)号：US20090165898A1

公开(公告)日：2009-07-02

申请号：US12324732

申请日：2008-11-26

申请人： SOPHIA L. WONG ,  ZHICHENG LIN ,  ALAN G. TAHRAN, JR.

发明人： SOPHIA L. WONG ,  ZHICHENG LIN ,  ALAN G. TAHRAN, JR.

IPC分类号： C22C19/00 ,  C22C30/00 ,  A61F2/94

CPC分类号： B23P17/00 ,  A61L31/022 ,  A61L31/14 ,  A61L2400/16 ,  C08L2201/12 ,  C22C14/00 ,  C22C19/007 ,  C22C19/03 ,  C22F1/10 ,  Y10T29/49863

摘要： Superelastic and/or shape memory nickel-titanium alloys having an increased fatigue life that is superior to known nickel-titanium alloys are disclosed. The nickel-titanium alloys have a minimum fatigue life that may be at least about 10 million strain cycles at a strain of at least about 0.75. The minimum fatigue life may be due, at least in part, to the nickel-titanium alloy having at least one of an oxygen concentration of less than about 200 ppm, a carbon concentration of less than about 200 ppm, the absence of oxide-based and/or carbide-based inclusions having a size greater than about 5 microns (μm), the presence of an R-phase, or combinations of the foregoing. Articles manufactured from such fatigue-resistant nickel-titanium alloys can be more durable because they are more resistant to repetitive strain and crack propagation.

摘要翻译： 公开了具有优于已知镍 - 钛合金的疲劳寿命增加的超弹性和/或形状记忆镍钛合金。 镍钛合金具有最小的疲劳寿命，其在至少约0.75的应变下可能为至少约1000万个应变循环。 最小的疲劳寿命可能至少部分地归因于具有小于约200ppm的氧浓度，小于约200ppm的碳浓度，低于约200ppm的氧浓度的氧 - 和/或具有大于约5微米（mum）的尺寸的碳化物基夹杂物，R相的存在或前述的组合。 由这种耐疲劳镍钛合金制成的制品可以更耐用，因为它们更能抵抗重复的应变和裂纹扩展。