|
This paper reports preliminary observations of in-situ straining experiments performed using transmission electron microscopy on thin foils of the B2 compounds FeAl and NiAl, and of a two-phase B2/(f.c.c.)L1{sub 2} alloy containing a B2 phase Ni-30Al-20Fe. The first compound slips by movement of a/2{l angle}111{r angle} dislocation pairs, whereas the latter two exhibit {l angle}100{r angle} slip. NiAl and FeAl both showed intense dislocation activity ahead of growing cracks. In both cases, slip occurred in several places within the thin foils and not just ahead of the cracks. Slip in NiAl was wavy and the ease of cross slip was such that at higher strains a cell structure formed during in-situ straining. In contrast, FeAl showed planar slip in broad bands consisting of several parallel slip planes. Ni-30Al-20Fe also exhibited planar slip, but on individual planes not in bands. Dislocation pile-ups were also observed in the latter compound. 11 refs., 6 figs.
|
| Authors: |
Baker, I.;
Nagpal, P. (Dartmouth Coll., Hanover, NH (USA). Thayer School of Engineering);
Guha, S. (Materials and Electrochemical Research Corp., Tucson, AZ (USA));
Horton, J.A. (Oak Ridge National Lab., TN (USA))
|
| Publication Date: | 1991 Jan 01 |
|---|
| OSTI Identifier: | OSTI ID: 5778871; Legacy ID: DE91012062 |
|---|
| Report Number(s): | CONF-9106146-3 |
|---|
| DOE Contract Number: | AC05-84OR21400; AC05-76OR00033 |
|---|
| Resource Type: | Conference/Event |
|---|
| Resource Relation: | 6. Japan Institute of Metals (JIM) international symposium on intermetallic compounds: structure and mechanical properties, Sendai (Japan), 17-20 Jun 1991 |
|---|
| Research Org: | Oak Ridge National Lab., TN (USA) |
|---|
| Sponsoring Org: | DOE; USDOE, Washington, DC (USA) |
|---|
| Country of Publication: | United States |
|---|
| Language: | English |
|---|
| Format: | Size: Pages: (6 p) |
|---|
| Other Number(s): | Other: ON: DE91012062 |
|---|
| Specific Type: | Technical Report |
|---|
| Subject: | 36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; CRACK PROPAGATION; CRYSTAL DEFECTS; IRON ALLOYS; NICKEL BASE ALLOYS; FOILS; SLIP; STRAINS; TRANSMISSION ELECTRON MICROSCOPY; ALLOYS; CRYSTAL STRUCTURE; ELECTRON MICROSCOPY; MICROSCOPY; NICKEL ALLOYS |
|---|
| Availability: | OSTI; NTIS; GPO Dep.; |
|---|
| Update Date: | 2008 Feb 07 |
|---|
Top |
|
