Soft and hard modes of deformation in MoSi{sub 2} single crystals

Book · Sat Jul 01 04:00:00 EDT 1995

OSTI ID:72493

Ito, K; Yano, T; Inui, H; Yamaguchi, M ^[1]

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1. Kyoto Univ. (Japan). Dept. of Materials Science and Engineering

The deformation behavior of MoSi{sub 2} single crystals has been studied in the temperature range of {minus}196{approximately}1,500 C. While [001]-oriented crystals can be plastically deformed only above 1,300 C, plastic flow is possible from temperatures as low as room temperature for single crystals with orientations other than [001]. Five slip systems, {l_brace}110){l_angle}111], {l_brace}011){l_angle}100], {l_brace}010){l_angle}100], {l_brace}023){l_angle}100] and {l_brace}013){l_angle}331], are identified to be operative, depending on crystal orientation. An anomalous increase in critical resolved shear stress (CRSS) is observed in the intermediate temperature Tango for the former three slip systems. Schmid`s law is generally valid for the soft modes, {l_brace}110){l_angle}111], {l_brace}011){l_angle}100] and {l_brace}023){l_angle}100]. In contrast, the CRSS for the hard mode, {l_brace}013){l_angle}331], strongly depends on crystal orientation with the higher values for orientations closer to [001].

• OSTI ID: 72493
• Report Number(s): CONF-941144--; ISBN 1-55899-265-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
EXPERIMENTAL DATA
HEAT RESISTING ALLOYS
INTERMETALLIC COMPOUNDS
MOLYBDENUM SILICIDES
MONOCRYSTALS
SLIP
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K