The characteristics of cavitation during superplastic deformation of a warm-rolled Al-Li-Cu-Mg-Zr alloy

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Scripta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-716X(91)90198-A· OSTI ID:5098692

Liu, Q ^[1]; Huang, X; Yang, J; Yao, M ^[2]

---

1. Analysis and Measurement Centre, Harbin Inst. of Tech., Harbin 150006 (CN)
2. Dept. of Metals and Technology, Harbin Inst. of Tech., Harbin 150006 (CN)

The process of superplastic forming has become important in numerous commercial applications. However, there may be some deleterious defects on the properties of superplastically-formed components due to the presence of minor levels of cavitation introduced during the forming process. Thus, it is important to obtain information on nucleation, growth and interlinkage of cavities in a wide range of superplastic materials. Two different thermomechanical processing routes may be employed to develop fine grain sizes conducive to superlasticity in Al-Li alloys. In one of them, a fine grain size microstructure is obtained by static recrystallization prior to superplastic deformation, and in another, a fine grain size microstructure is obtained by deformation-induced recrystallization during the initial stage of superplastic deformation. The deformation-induced recrystallization of a cold (or warm)-rolled Al-Li alloy is strongly dependent on the strain rate microstructural change during the initial stage of superplastic deformation due to deformation-induced recrystallization. There have been some studies dealing with cavitation in superplastic Al-Li alloys. However, there is no research work reported on the effect of deformation-induced recrystallization on the characteristics of cavitation during superplastic deformation of a warm-rolled Al-Li alloy. This paper deals with the relationship between deformation-induced recrystallization and cavitation characteristics during superplastic deformation of a warm-rolled Al-Li-Cu-Mg-Zr alloy. The results show that there are three kinds of cavities. The first includes the fine cavities formed at the beginning stage of deformation, the second the large cavities formed around the intermetallic particles and the third the grain boundary cavities. All three kinds of cavities are closely related to deformation-induced recrystallization.

• OSTI ID: 5098692
• Journal Information: Scripta Metallurgica; (United States), Vol. 25:1; ISSN 0036-9748
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
NUCLEATION
HEAT RESISTING ALLOYS
DEFORMATION
ZIRCONIUM ALLOYS
CAVITATION
CAVITIES
COPPER ALLOYS
GRAIN BOUNDARIES
LITHIUM ALLOYS
MAGNESIUM ALLOYS
PLASTICITY
RECRYSTALLIZATION
STRESS RELAXATION
ALLOYS
CRYSTAL STRUCTURE
HEAT RESISTANT MATERIALS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
RELAXATION
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies