{l_angle}100{r_angle} Burgers vector in single phase {gamma}{prime} material verified by image simulation
- Technische Univ. Berlin (Germany)
- Friedrich-Schiller-Univ. Jena (Germany). Metallische Werkstoffe
The deformation mechanisms of Ni{sub 3}Al, an ordered L1{sub 2} or {gamma}{prime} phase, is under intense research since Westbrook showed the increase of its hardness with temperature in 1957. The super dislocations of this ordered phase normally have Burgers vectors {rvec b} = a {l_angle}110{r_angle}, disassociated in either two a/2 {l_angle}110{r_angle} or two {rvec b} = a/3 {l_angle}112{r_angle}, depending on deformation temperature and rate. Recent observations in [111] oriented {gamma}{prime} specimens suggest that additional dislocations with the shorter Burgers vector {rvec b} = a {l_angle}100{r_angle} might be active. Dislocations with {rvec b} = a {l_angle}110{r_angle} on cube glide planes have a Schmidt factor of 0.47 and on octahedral planes of 0.27. Dislocations with {rvec b} = a {l_angle}100{r_angle} have a Schmidt factor of 0.47 for {l_brace}110{r_brace} glide planes and 0.33 for cube glide planes. The a {l_angle}100{r_angle} Burgers vector is the shortest of all complete dislocations of the L1{sub 2} structure and creates no planar fault like antiphase boundaries or stacking faults. Due to the [111] oriented stress axis, which is used in this contribution, plastic deformation by a {l_angle}100{r_angle} dislocations as well as cube glide planes for {l_angle}110{r_angle} dislocations is encouraged. These dislocations could be reaction products, but will soon after contribute to deformation.
- OSTI ID:
- 305416
- Journal Information:
- Scripta Materialia, Vol. 40, Issue 1; Other Information: PBD: 4 Dec 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
{l_angle}111{r_angle} Slip in NiAl single crystals between 4.2K and 100K
Embedded atom method simulation of 1/2{l_angle}110{r_angle} dislocation core structures