کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7903037 | 1510459 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Strengthening and toughening of Mg-based bulk metallic glass via in-situ formed B2-type AgMg phase
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
By tuning the composition and melt cooling rate, in situ composites of bulk metallic glass (BMG) with primary phase of B2-type AgMg compound can be fabricated in Mg-Cu-Ag-Y quaternary systems. In the composite, volume fraction of AgMg dendrites dispersed in the glass matrix varies in a range of 20-40%. In contrast to monolithic BMG, Mg52.8Cu19.9Ag19.5Y7.8 composite with AgMg of 40Â vol.% dendrites manifest a distinct improvement in the compressive yield strength (~Â 1040Â MPa), fracture strength (1.2Â GPa) and plastic strain (0.4-2%), as well as an apparent work-hardening effect. Moreover, AgMg phase in the composite plays a significant role to suppress the crack propagation, then enhancing the fracture toughness, as indicated by an increment of notch toughness (KQ) from ~Â 6Â MPa m1/2 of monolithic BMG to ~Â 8Â MPa m1/2 of the composite. However, since the tiny plastic zone size of glassy matrix is unable to match the microstructural length scales, improvement in the ductility and toughness of Mg-based BMG in situ composite remains limited.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 379, 1 November 2013, Pages 40-47
Journal: Journal of Non-Crystalline Solids - Volume 379, 1 November 2013, Pages 40-47
نویسندگان
Shao-Gang Wang, Jian Xu,