کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7982258 | 1514757 | 2013 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Critical issues related to instrumented indentation on non-uniform materials: Application to niobium subjected to high pressure torsion
ترجمه فارسی عنوان
مسائل بحرانی مربوط به انداختن ابزار بر روی مواد غیر یکنواخت: کاربرد نایوبیم تحت فشار تورشی بالا
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کلمات کلیدی
نانو انداختن، حساسیت نرخ فشار، نیوبیم، چرخش فشار بالا، انباشته شدن،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
Nanoindentation is a powerful tool for characterizing the mechanical properties of materials at small length scales. Since the loading rate can be accurately recorded and controlled during a nanoindentation test, the strain rate dependence of these properties can also be determined. However, there are still a few problems that need to be addressed when it is applied to some special materials. High pressure torsion (HPT) processed metals are examples of these materials with non-uniform microstructures and mechanical properties. In this work, commercially pure niobium disks with diameter of ~10.0Â mm and thickness of ~1.0Â mm were processed by HPT. Grain sizes from a few nanometers to a few micrometers were generated due to a strong radial strain gradient in the disk. Instrumented nanoindentation tests were conducted at different radial locations of the HPT niobium disk. During each test, the loading rate was controlled so that the indentation strain rate was kept constant. Some key issues associated with the nanoindentation experiment, such as contact stiffness, contact area and the effect of pile-up or sink-in were evaluated and discussed carefully. The work-based method was used in data processing and it was compared with other approaches. The effects of indentation location, i.e., grain size, as well as indentation strain rate were characterized.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 586, 1 December 2013, Pages 149-159
Journal: Materials Science and Engineering: A - Volume 586, 1 December 2013, Pages 149-159
نویسندگان
Y.Z. Guo, N.A. Behm, J.P. Ligda, Y.L. Li, Z. Pan, Z. Horita, Q. Wei,