EFFECTS OF TEST TEMPERATURE ON FLOW OF METALLIC GLASSES

NOURI, A.S. ; LIU, Y. ; WESSELING, P. ; LEWANDOWSKI, J.

United States. Department of Energy. Yucca Mountain Project Office.

关键词: Mechanical Properties;    Strain Rate;    Processing;    36 Materials Science;    Metallic Glasses;   

DOI  :  10.2172/886562
RP-ID  :  NA
RP-ID  :  NA
RP-ID  :  886562

美国|英语

来源: UNT Digital Library

【 摘 要 】

Micro-hardness experiments were conducted over a range of temperatures using a Nikon QM micro-hardness machine on a number of metallic glass (e.g. Zr-, Fe-, Al-) systems. Although high micro-hardness was exhibited at room temperature, significant hardness reductions were exhibited near the glass transition temperature, T{sub g}. The effects of changes in test temperature on the micro-hardness will be reported. The effects of exposure time on the hardness evolution at a given temperature will also be summarized to illustrate some of the differences in behavior of the systems shown. The extreme softening near T{sub g}, characteristic of bulk metallic glass systems, enables the exploration of novel deformation processing. In order to develop deformation processing windows, the evaluation of bulk metallic glass mechanical properties under quasi-static conditions and the determination of flow properties at different temperatures and strain rates are reported. The use of such information to create layered/composite bulk metallic glasses will be summarized.