On mechanical properties and superplasticity of Mg–15Al–1Zn alloys processed by reciprocating extrusion

Lee, Shih‐Wei; Chen, Yuliang; Wang, Hsiao-Yun; Yang, Chao-Fu; Yeh, Jien‐Wei

doi:10.1016/j.msea.2007.01.119

Cited by 46 publications

(14 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Maximum estimated value of the stress sensitivity parameter exhibits 1.43. In order to understand the deformation mechanisms during superplastic process, the apparent superplastic deformation activation energy Q s may be calculated [15]:…”

Section: Resultsmentioning

confidence: 99%

Superplastic Behaviour of an Mg-Ag-RE Magnesium Alloy

et al. 2015

View full text Add to dashboard Cite

Fine-grained magnesium alloy QE22 (Mg2.5wt.%Ag2.5wt.%RE0.6wt.%Zr) was prepared from cast ingot which was submitted to a two stages heat treatment. Subsequently the billet was overaged and extruded at high temperature. Samples were deformed at elevated temperatures from 380• C up to 480• C at various strain rates. Microstructure of deformed samples was studied using light and electron microscopy. Conditions for superplasticity of the investigated alloys have been estimated. Possible deformation mechanisms are discussed.

show abstract

Section: Resultsmentioning

confidence: 99%

Superplastic Behaviour of an Mg-Ag-RE Magnesium Alloy

et al. 2015

View full text Add to dashboard Cite

show abstract

“…In both samples the grains seem to rotate during the deformation process. This morphology is often observed when grain boundary sliding is the ratecontrolling mechanism [8,17,30]. Bieler et al [33] demonstrated that this kind of morphology corresponds to grain boundary sliding as the main mechanism during superplastic deformation of mechanically alloyed aluminium in which the strain rate sensitivity was 0.5.…”

Section: Microstructure and Texturementioning

confidence: 99%

“…Much work has been carried out in order to improve the formability and mechanical properties of wrought magnesium alloys. Current research in this area is concerned with the development of new alloy systems, the understanding of the deformation mechanisms involved during the deformation of polycrystalline magnesium alloys and on thermomechanical treatments that allow the microstructure and formability at low temperatures to be improved [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Intermediate temperature deformation behaviour of fine grained AZ61 alloy processed by hydrostatic extrusion

Victoria-Hernández

Hernández-Silva

et al. 2011

Materials Science and Engineering: A

View full text Add to dashboard Cite

Abstract:In this work, the intermediate temperature deformation behaviour of AZ31 and AZ61 alloys processed by hydrostatic extrusion has been examined. By means of this thermomechanical process it is possible to refine the microstructures of the AZ31 and AZ61 alloys to generate average grain sizes of 2.3 and 3.5 µm respectively. The evolution of microstructure and texture after tensile testing at 175, 200 and 225 °C in air at three different strain rates of 10 -2 , 10 -3and 10 -4 s -1 was investigated. It was found that both alloys exhibit low temperature superplasticity, at 200 °C for AZ31and at 175 °C for the AZ61 alloy. The maximum elongation recorded for AZ31 was 395 % at 225 °C and 10 -4 s -1, and 540 % for AZ61 tested at 225 °C and 1.5·10 -3 s -1 . The intermediate temperature deformation behaviour is explained by the combination of three different mechanisms: I) dislocation creep, II) low temperature dynamic recrystallisation (LTDRX) and III) grain boundary sliding (GBS).

show abstract

“…The inhomogeneous distributions of grain sizes and precipitations arose from a non-uniform distribution of Al in the ascast structures. The high Al content and the original eutectic phases (in only the AZ91À3Sn) in the interdendrites yielded a high proportion of precipitates [11,12,14], providing many nucleation sites for dynamic recovery and recrystallization during severe extrusive deformation, retarding the migration of boundaries for grain growth, and eventually yielding the observed dark bands of clustered precipitates and fine grains.…”

Section: Microstructural Evolution and Refinementmentioning

confidence: 99%