Overview on superplasticity research on small-grained materials
- Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
- Lawrence Livermore National Lab., CA (United States)
Superplasticity is generally associated with fine grains, grain boundary sliding, and high tensile ductility at elevated temperature. This paper reviews some of the recent important findings in fine-grained superplasticity, including the areas of superplastic ceramics and bf-high-strain-rate superplasticity (HSRS). Deformation mechanism maps are shown to be powerful tools for predicting the conditions where HSRS can be expected. Ultrafine grained materials, processed economically, remain an important objective in achieving HSRS. Threshold stresses, observed in fine-grained superplastic materials, are shown to be functions of temperature and grain size but their origin, however, remains obscure. Quasi-superplastic materials, with a strain-rate-sensitivity exponent of m = 0.33, are shown to have high elongations, and have considerable promise for netshape isothermal forming of sheet and bulk components.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Department of Defense, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10174798
- Report Number(s):
- UCRL-JC-117600; CONF-9405193-2; ON: DE94016550
- Resource Relation:
- Conference: International conference on superplasticity in advanced materials (ICSAM),Moscow (Russian Federation),24-26 May 1994; Other Information: PBD: Jul 1994
- Country of Publication:
- United States
- Language:
- English
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