Effects of Thermal Exposure and Test Temperature on Structure Evolution and Hardness/Viscosity of an Iron-Based Metallic Glass

被引：27

作者：

Nouri, A. Shamimi ^{[1
]}

Liu, Y. ^{[1
,2
]}

Lewandowski, J. J. ^{[1
]}

机构：

[1] Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA

[2] Wayne State Univ, Dept Chem, Detroit, MI 48202 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2009年 / 40A卷 / 06期

关键词：

MECHANICAL-PROPERTIES; SUPERCOOLED LIQUID; VISCOSITY; FLOW; RELAXATION; PRESSURE;

D O I：

10.1007/s11661-008-9615-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-temperature microhardness testing on drop-cast ingots of fully amorphous Fe48Mo14Cr15Y2C15B6 was performed in order to determine the behavior and structure evolution of this Fe-bulk metallic glass under a variety of different test conditions. The effects of changes in test temperature on the microhardness/strength were determined over the temperature range from room temperature to 620 A degrees C. Although high (e.g., > 12 GPa) microhardness was exhibited at room temperature, significant hardness reductions were exhibited near T (g) . In addition, the effect of exposure time (up to 300 minutes) at elevated temperature on the evolution of microhardness/strength was also evaluated for selected temperatures between 25 A degrees C and 620 A degrees C. The microhardness results were complemented with X-ray diffraction (XRD), conventional transmission electron microscopy (TEM), and an in-situ heating TEM study in order to evaluate any structural evolution that could explain the large differences in hardness evolution under different test conditions.

引用

页码：1314 / 1323

页数：10

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