Deformation of two C36 Laves phases by microhardness indentation at room temperature
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Materials Science and Engineering
Microhardness indentation and electron microscopy were used to study the room-temperature deformation behavior of two Laves phases, ZrFe{sub 2} and MgNi{sub 2}, in two-phase alloys. Evidence of extensive plastic deformation was found around the indentations. Activation of basal and nonbasal slip systems forms a distinctive cell structure in both Laves phases. Slip on planes nearly normal to the basal plane occurs in the lamellar form of ZrFe{sub 2}. Burgers vectors of the dislocations and resulting shear displacements are studied using high-resolution transmission electron microscopy (TEM). Curved or zigzag nonbasal slip surfaces in atomic scale were observed. Each slip plane can be considered to be composed of a series of small facets of high atomic density. A common Burgers vector and displacement vector component of 1/4 [0001] was found on many different slip planes. The ``zonal glide`` concept for slip on prismatic planes is discussed.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-90ER45426
- OSTI ID:
- 72782
- Journal Information:
- Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 5 Vol. 26; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
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