Superplastic forming of 7475 Al alloy by variable-pressure blowing

Journal Article · Wed May 15 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00019-X· OSTI ID:247974

Yang, C F; Chiu, L H; Lee, S C ^[1]

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1. Tatung Inst. of Tech., Taipei (Taiwan, Province of China). Dept. of Materials Engineering

Although the bulge forming technique is currently employed in commercial superplastic forming (SPF) processes, the uniaxial tensile test is still the most commonly used method for the evaluations of the superplasticity of materials due to its simplicity in testing. The bulge forming of domes is usually involved in the early stages of superplastic forming processes and hence attracted many research attentions. In this study the superplastic bulge forming of 7475 Al alloy by the constant-pressure blowing and the constant strain rate variable-pressure blowing were studied. In addition, a step-change pressure forming process to shorten the forming time spans required for specific amounts of forming strain by several easy step changes of forming pressure were proposed and examined. The purpose of this work is to characterize the forming behaviors of 7475 Al alloy by these forming processes and to compare the forming efficiency of variable-pressure forming processes to those of constant-pressure forming ones.

• OSTI ID: 247974
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
ARGON
COPPER ALLOYS
CORRELATIONS
DIES
EFFICIENCY
GRAIN SIZE
MAGNESIUM ALLOYS
MATERIALS WORKING
PRESSURE DEPENDENCE
STRAIN RATE
STRAINS
STRESSES
ZINC ALLOYS