کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10620556 | 988637 | 2011 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lattice modulation and superelasticity in oxygen-added β-Ti alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
The microstructure and martensitic transformation behavior of (Ti-23Nb)-1.0O (at.%) alloy have been closely and systematically investigated by transmission electron microscopy (TEM). Diffuse streaks along the ã110ãβâ directions with intensity maxima at 1/2 positions between basal spots are observed in selected area diffraction patterns obtained from the β phase. The streaks correspond to six variants of {110}βã11¯0ãβ transverse lattice modulation caused by randomly distributed oxygen atoms and their local strain fields. Nanosized modulated domains (nanodomains) in the β phase are confirmed in dark field micrographs. These nanodomains act as local barriers to martensitic transformation, thereby suppressing long-range martensitic transformation in the (Ti-23Nb)-1.0O alloy. We suggest a new mechanism for superelasticity in oxygen-containing β-Ti-Nb alloys based on the results of in situ X-ray diffraction measurements and in situ TEM observations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 59, Issue 16, September 2011, Pages 6208-6218
Journal: Acta Materialia - Volume 59, Issue 16, September 2011, Pages 6208-6218
نویسندگان
Masaki Tahara, Hee Young Kim, Tomonari Inamura, Hideki Hosoda, Shuichi Miyazaki,