Anomalously high impact fracture toughness in B.C.C. Mg-Li between 4.2 K and 77 K
- Ames Lab., IA (United States)
- Siberian Aerospace Academy, Krasnoyarsk (Russian Federation)
Mg-Li alloys` unique combination of low density and extraordinary ductility have interested engineers and scientists since the 1940`s. As a preliminary phase of a larger program to investigate the potential for strengthening Mg-Li with dispersed metallic reinforcing phases, this study was designed to measure the grain size dependence of the ductile-brittle transition temperature of a single-phase, body-centered cubic alloy of Mg-12 weight % Li. Most body-centered cubic (BCC) metals undergo a transition from ductile to brittle fracture as the temperature is lowered. These transition temperatures vary widely for different BCC metals; for example, plain carbon steel transition temperatures range from 200K for very low C content to 450K for high C content. Hexagonal close-packed metals often experience embrittlement at low temperatures, although the transition is usually not as abrupt. The ductile to brittle transition has been studied by tensile test in several HCP Mg alloys (8-9), but not in binary BCC Mg-Li. No impact test data for binary BCC Mg-Li alloys were found in the literature.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 305422
- Journal Information:
- Scripta Materialia, Vol. 39, Issue 12; Other Information: PBD: 13 Nov 1998
- Country of Publication:
- United States
- Language:
- English
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