Transformational superplasticity in pure Bi$sub 2$$O$$sub 3$ and the Bi$sub 2$$O$$sub 3$--Sm$sub 2$$O$$sub 3$ eutectoid system

Conference · Wed Jan 01 04:00:00 EST 1975

OSTI ID:4030023

Johnson, C A; Smyth, J R; Bradt, R C; Hoke, J H; Bradt, R C; Tressler, R E ^[1]

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1. eds.

Results for Bi$sub 2$$O$$sub 3$ and the Bi$sub 2$$O$$sub 3$--Sm$sub 2$$O$$sub 3$ eutectoid show that ceramics can exhibit superplasticity analogous to that of metals. Results are in tentative agreement with the Greenwood and Johnson theory, but additional criteria must be met for ceramics to exhibit transformational superplasticity, a large transformational volume change to induce large internal stresses and the occurrence of the transformation at T/T/ sub mp/ greater than or equal to 0.75. It is suggested that the process is a grain boundary sliding mechanism. (DLC)

• Research Organization: General Electric Co., Schenectady, NY
• NSA Number: NSA-33-026502
• OSTI ID: 4030023
• Country of Publication: United States
• Language: English

Related Subjects

*BISMUTH OXIDES-- DEFORMATION
*SAMARIUM OXIDES-- DEFORMATION
360202* --Materials--Ceramics
Cermets & Refractories-- Structure & Phase Studies
ALLOTROPY
MICROSTRUCTURE
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
PHASE TRANSFORMATIONS
PLASTICITY
STRAINS