کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1579985 | 1514838 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Porous NiTi by creep expansion of argon-filled pores
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
NiTi powders are densified in the presence of argon gas, whose initial pressure is varied between 1 and 33Â atm, to create NiTi billets containing isolated Ar-filled pores. Upon vacuum annealing, the pressurized pores expand by creep of the surrounding NiTi matrix at rates which are in agreement with a simple analytical model up to 16% porosity. Beyond this porosity, foaming becomes very slow, as pores connect with each other and with the specimen surface where the gas escapes. This is due to failure of previous NiTi powder boundaries weakened by oxides insoluble in NiTi; this mechanism does not occur in Ti foams which dissolve their oxides at high temperature, allowing higher levels of pore expansion and foam porosity. NiTi with 10-16% porosity exhibits Young's moduli of 48-57Â GPa, and may be useful for high-strength, low stiffness biomedical implants with superelastic or shape-memory properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 523, Issues 1â2, 15 October 2009, Pages 70-76
Journal: Materials Science and Engineering: A - Volume 523, Issues 1â2, 15 October 2009, Pages 70-76
نویسندگان
Scott M. Oppenheimer, David C. Dunand,