کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1574476 1514721 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of the grain/subgrain size on the strain-rate sensitivity and deformability of Ti–50 at%Ni alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Effect of the grain/subgrain size on the strain-rate sensitivity and deformability of Ti–50 at%Ni alloy
چکیده انگلیسی

The strain-rate sensitivity of coarse-grained (CG) and ultrafine-grained (UFG) Ti–50 at%Ni alloys was studied in the 20–500 °C temperature range. In the 10−3–10−5 s−1 strain rate range, the maximum strain-rate sensitivity exponent m was measured by the strain-rate-jump test, while in the 10−5–10−6 s−1 strain rate range, m was measured by the stress-jump creep test. It was determined that the smaller the initial grain/subgrain size (d), the lower the deformation temperature (Td) and the higher the strain rate (ε̇) leading to superplasticity (m=0.5): for d=250 nm, Td=400 °C and ε̇∈[0.4–2.5]×10−5 s−1, while for d=500 nm, Td=500 °C and ε̇∈[0.1–3]×10−5 s−1. The low-temperature deformability of the CG and UFG Ti–Ni alloys have also been compared under conditions of severe cold rolling (accumulated strain of 2) by measuring the length and concentration of the processing-induced microcracks. The results of this study showed an increase in the low-temperature deformability of UFG Ti–Ni alloy compared to CG Ti–Ni alloy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 622, 12 January 2015, Pages 21–29
نویسندگان
, , , , , ,