Characterization of Mg AZ31 Alloy ECASD Processed Using Dynamical Mechanical Analysis (DMA)

2015 ◽  
Vol 1766 ◽  
pp. 109-114
Author(s):  
Daniel Peláez ◽  
Adriana Restrepo-Osorio ◽  
Emigdio Mendoza ◽  
Cesar Isaza ◽  
Patricia Fernandez-Morales
Keyword(s):  
Plastic Deformation ◽  
Magnesium Alloy ◽  
Room Temperature ◽  
Az31 Alloy ◽  
Mechanical Analysis ◽  
Metal Plate ◽  
Dynamical Mechanical Analysis ◽  
Dimensional Changes ◽  
Severe Plastic Deformation Technique

ABSTRACTIn the present work was used Dynamical Mechanical Analysis (DMA) to study the magnesium alloy Mg AZ31-B, in plate form with a thickness of 2.5 mm. The plates were processed using Equal Channel Angular Sheet Drawing (ECASD), which is a severe plastic deformation technique, which allows imposing strain without dimensional changes to a metal plate, at room temperature with an angle of 135°. The obtained results show dependence between the storage modulus (M’), temperature and frequency used on the tests. The greater M’ values were obtained at the lower temperatures and at the higher frequency used. However, at lower frequencies M’ response is not affected by the used frequencies. At the higher temperatures there is an M’ reduction, which promotes the material deformation.

A comparative study of plastic deformation mechanisms in room-temperature and cryogenically deformed magnesium alloy AZ31

2021 ◽  
Vol 807 ◽  
pp. 140821
Author(s):  
Kai Zhang ◽  
Zhutao Shao ◽  
Christopher S. Daniel ◽  
Mark Turski ◽  
Catalin Pruncu ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Magnesium Alloy ◽  
Comparative Study ◽  
Room Temperature ◽  
Deformation Mechanisms ◽  
Alloy Az31 ◽  
Magnesium Alloy Az31

scholarly journals Characterization of Nickel Alloy 600 with Ultra-Fine Structure Processed by Severe Plastic Deformation Technique (SPD)

2017 ◽  
Vol 05 (04) ◽  
pp. 33-44
Author(s):  
Waldemar Alfredo Monteiro ◽  
Silvio Luis Ventavele da Silva ◽  
Luciana Ventavele da Silva ◽  
Arnaldo Homobono Paes de Andrade ◽  
Luis Carlos Elias da Silva
Keyword(s):  
Plastic Deformation ◽  
Fine Structure ◽  
Severe Plastic Deformation ◽  
Nickel Alloy ◽  
Alloy 600 ◽  
Severe Plastic Deformation Technique

Study on Compression Behaviour of AZ31 Magnesium Alloy at Room-Temperature

2012 ◽  
Vol 476-478 ◽  
pp. 1960-1964
Author(s):  
Jia Le Sun ◽  
Rui Chun Li ◽  
Gao Feng Quan ◽  
Zhao Ming Liu
Keyword(s):  
Magnesium Alloy ◽  
Strain Hardening ◽  
Room Temperature ◽  
Deformation Behaviour ◽  
Az31 Alloy ◽  
Strain Hardening Exponent ◽  
Surface Cracks ◽  
Compression Properties ◽  
Compression Behaviour ◽  
Az31 Mg Alloy

The microstructure, surface morphology, compression properties, deformation behaviour and strain hardening exponent of as-cast and as-extruded AZ31 Mg alloy after different annealing treatments were investigated. The results show that the compression properties are great different between cast AZ31 alloy and extruded AZ31 alloy. Extruded AZ31 alloy is discontinuous yield and on the surface no signs of damage have been observed; on the contrast, cast AZ31 alloy is continuous yield and shows wavy patterns, and the surface cracks can be easily found. In addition, there is a linear relationship between the strain hardening exponent in first deformation stage and the yield ratio. Further more, the twinning mechanism plays very different role in cast AZ31 alloy and extruded AZ31 alloy.

scholarly journals Synthesis and characterization of biodegradable aliphatic copolyesters with hydrophilic soft segments

2004 ◽  
Vol 69 (12) ◽  
pp. 1013-1028 ◽  
Author(s):  
Danijela Jovanovic ◽  
Marija Nikolic ◽  
Jasna Djonlagic
Keyword(s):  
Mechanical Analysis ◽  
Transesterification Reaction ◽  
Degree Of Crystallinity ◽  
Solution Viscosity ◽  
Butylene Succinate ◽  
Dynamical Mechanical Analysis ◽  
Soft Segments ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

segmented poly(ester-ether)s based on poly(butylene succinate) and two different types of polyethers were investigated. The poly(ester-ether)s were synthesized by transesterification reaction of dimethyl succinate 1,4-butanediol and poly(ethylene oxide) (PEO, Mn = 1000 g/mol) in the first series, and poly(tetramethylene oxide) (PTMO,Mn = 1000 g/mol) in the second. The mass fraction of soft segments was varied between 10 and 50 mass. %. The effect of the introduction of two different polyether soft segments on the structure, thermal and rheological properties were investigated. The composition of the poly(ester-ether)s, determined from their 1H-NMR spectra showed that incorporation of soft polyether segments was successfully performed by the transesterification reaction in bulk. The molecular weight was estimated from solution viscosity measurements and complex dynamic viscosities. The thermal properties investigated by DSC indicated that the presence of soft segments lowers the melting and crystallization temperature of the hard phase, as well as the degree of crystallinity. Dynamical mechanical analysis was used to investigate the influence of composition on the rheological behavior of the segmented poly(ester-ether)s. The results obtained from an enzymatic degradation test performed on some of the synthesized polymers showed that the biodegradability is enhanced with increasing hydrophilicity.

scholarly journals A Dislocation-scale Characterization of the Evolution of Deformation Microstructures around Nanoindentation Imprints in a TiAl Alloy

2018 ◽  
Author(s):  
Antoine Guitton ◽  
Hana Kriaa ◽  
Emmanuel Bouzy ◽  
Julien Guyon ◽  
Nabila Maloufi
Keyword(s):  
Plastic Deformation ◽  
Room Temperature ◽  
Tial Alloy ◽  
Mechanical Twinning ◽  
Contrast Imaging ◽  
Electron Channeling ◽  
The Poor ◽  
Before And After ◽  
Scale Characterization

In this work, plastic deformation was locally introduced at room temperature by nanoindentation on a γ-TiAl based alloy. Comprehensive analyzes of microstructures were performed before and after deformation. In particular, the Burgers vectors, the line directions and the mechanical twinning systems were studied via accurate electron channeling contrast imaging. Accommodation of the deformation are reported and a scenario is proposed. All features help to explain the poor ductility of the TiAl based alloys at room temperature.

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