کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1448018 988662 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Superplastic compressive flow in MgB2
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Superplastic compressive flow in MgB2
چکیده انگلیسی

Macroplasticity in the brittle, superconducting ceramic MgB2 would allow for the mechanical drawing of thin, dense superconducting wires, as done for metallic superconductors. Here, we report very large uniaxial compressive deformation (engineering strain of 67% or true strain of −1.1) without fracture at 1000 °C for specimens densified from commercially available MgB2 powders with MgO and MgB4 second phases. Plastic flow occurs under a diffusion-controlled mechanism with activation energies of 255–447 kJ mol−1 and stress exponents of 1.4–2.0, indicative of superplastic behavior.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 57, Issue 16, September 2009, Pages 4745–4750
نویسندگان
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