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吕昭平, H. Bei, , Z. P. Lu, E. P. George
PHYSICAL REVIEW LETTERS VOLUME 93, NUMBER 12, 17 SEPTEMBER 2004,-0001,():
-1年11月30日
The mechanical behavior of bulk metallic glasses (BMGs) was investigated by nanoindentation with a spherical indenter. The transition from perfectly elastic behavior to plastic deformation was clearly observed as a pop-in event (sudden displacement excursion) on the load-displacement curves. Hertzian stress analysis was used to describe fully the load-displacement behavior during elastic deformation and to determine the theoretical shear strengths of the BMGs.
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吕昭平, Z.P. Lu, H. Tan, Y. Li, S.C. Ng
Scripta mater. 42 (2000) 667-673,-0001,():
-1年11月30日
Differential thermal analysis (, DTA), , Metallic glasses, Melt-spinning, Glass forming ability (, GFA),
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【期刊论文】Structural Amorphous Steels
吕昭平, Z. P. Lu, C.T. Liu, J. R. Thompson, , W. D. Porter
PHYSICAL REVIEW LETTERS VOLUME 92, NUMBER 24, 18 JUNE 2004,-0001,():
-1年11月30日
Recent advancement in bulk metallic glasses, whose properties are usually superior to their crystalline counterparts, has stimulated great interest in fabricating bulk amorphous steels. While a great deal of effort has been devoted to this field, the fabrication of structural amorphous steels with large cross sections has remained an alchemist’s dream because of the limited glass-forming ability (GFA) of these materials. Here we report the discovery of structural amorphous steels that can be cast into glasses with large cross-section sizes using conventional drop-casting methods. These new steels showed interesting physical, magnetic, and mechanical properties, along with high thermal stability.
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【期刊论文】Role of yttrium in glass formation of Fe-based bulk metallic glasses
吕昭平, Z. P. Lu, C. T. Liu, W. D. Porter
APPLIED PHYSICS LETTERS VOLUME 83, NUMBER 13, 29 SEPTEMBER 2003,-0001,():
-1年11月30日
In this study, we discovered that a small addition of Y is very effective in improving glass-forming ability of Fe-based alloys. As-cast bulk amorphous alloys containing 2 at.% Y showed large thermal stability, with glass transition temperatures above 900 K and supercooled liquid regions above 55 K, and high strength, with Vickers hardnesses larger than HV 1200. The beneficial effect of Y on glass formation is twofold: (1)Y adjusted the compositions closer to the eutectic and thus lowered their liquidus temperatures, and (2) Y improved the manufacturability of these alloys by scavenging the oxygen impurity from it via the formation of innocuous yttrium oxides.
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【期刊论文】Oxygen effects on plastic deformation of a Zr-based bulk metallic glass
吕昭平
,-0001,():
-1年11月30日
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