Effects of Thermal Exposure and Test Temperature on Structure Evolution and Hardness/Viscosity of an Iron-Based Metallic Glass
Effects of Thermal Exposure and Test Temperature on Structure Evolution and Hardness/Viscosity of an Iron-Based Metallic Glass
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DOI：
10.1007/s11661-008-9615-1
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发表时间：
2009-06-01
影响因子：
2.8
通讯作者：
Lewandowski, J. J.
中科院分区：
文献类型：
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作者：
Nouri, A. Shamimi;Liu, Y.;Lewandowski, J. J.
对完全非晶Fe 48 Mo 14 Cr 15 Y2 C15 B6的滴铸铸锭进行了高温显微硬度测试，以确定在各种不同测试条件下这种Fe-块体金属玻璃的行为和结构演变。在从室温到620 A ℃的温度范围内测定试验温度变化对显微硬度/强度的影响。虽然高（例如，> 12 GPa）的显微硬度，在T（g）附近显示出显著的硬度降低。此外，还针对25 A ℃至620 A ℃之间的选定温度评估了高温下暴露时间（长达300分钟）对显微硬度/强度演变的影响。显微硬度结果补充了X射线衍射（XRD），传统的透射电子显微镜（TEM），和原位加热TEM研究，以评估任何结构演变，可以解释在不同的测试条件下硬度演变的巨大差异。
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.