Strengthening mechanisms in the rapidly solidified AZ 91 magnesium alloy

Nussbaum, G.; Sainfort, P.; Regazzoni, G.; Gjestland, Haavard

doi:10.1016/0036-9748(89)90303-7

Cited by 123 publications

(42 citation statements)

References 4 publications

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“…The K-slope of these equations might be somewhat higher than the value reported in literature, 30) usually less than 250 MPa·µm 1/2 . This might be due to the fact that those stress data corresponding to small grain sizes included some work hardening contribution, thus raising the K-slope.…”

Section: Annealing At 350contrasting

confidence: 55%

High Strain Rate and/or Low Temperature Superplasticity in AZ31 Mg Alloys Processed by Simple High-Ratio Extrusion Methods

Lin

Huang

2002

Mater. Trans.

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There have been numerous efforts in processing metallic alloys into fine-grained materials, so as to exhibit high strain rate superplasticity (HSRSP) and/or low temperature superplasticity (LTSP). The current study applied the most simple and feasible one-step extrusion method on the commercial AZ31 magnesium ingot to result in HSR<SP. The one-step extrusion was undertaken using a high extrusion ratio at 250-350 • C, and the grain size after one-step extrusion became ∼ 1-4 µm. The processed AZ31 plate exhibited satisfactory room temperature tensile elongation of 30-50%; 200 • C elongations of 600% at 1 × 10 −4 s −1 and 425% at 1 × 10 −3 s −1 ; and 300 • C elongations of 900% at 1 × 10 −4 s −1 , 520% at 8 × 10 −3 s −1 , 300% at 2 × 10 −2 s −1 , and 210% at 1 × 10 −1 s −1 . This suggests that the current AZ31 Mg alloy has possessed HSRSP at relatively low temperatures of 280-300 • C, as well as LTSP at 200 • C. The low flow stress of 15-30 MPa and the true strain rate sensitivity of 0.3-0.4 both suggest that grain boundary sliding and solute drag creep have operated under these loading conditions. The current results imply that the simple high-ratio extrusion method might be a feasible processing mean for industry applications.

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Section: Annealing At 350contrasting

confidence: 55%

High Strain Rate and/or Low Temperature Superplasticity in AZ31 Mg Alloys Processed by Simple High-Ratio Extrusion Methods

Lin

Huang

2002

Mater. Trans.

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“…[17][18][19][20] Since it is hard to estimate the yield strength at each region of the joints, the coefficient could not be compared to this work directly. Park et al found the Hall-Petch relation in the friction stir welded AZ91D, which is almost similar to the eq.…”

Section: Hall-petch Relationmentioning

confidence: 99%

Microstructural Development in Friction Welded AZ31 Magnesium Alloy

et al. 2006

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Microstructural development of friction welded AZ31 alloy was studied. The microstructures near weld interface consist of mainly three regions that are recrystallized fine-grain, mixed-grain and twin regions. The most impressive microstructural feature is grain refinement. Fine grains whose size was approximately 2 mm were produced at the weld interface due to a hot heavy working, resulting in the increase of microVickers hardness. New fine grains were born at the shear bands that were introduced during the friction and upset processes. The grain size depended on the welding condition, especially the upset pressure. The smaller grains were obtained with higher upset pressure and shorter friction time. Although Hall-Petch relation was basically realized in friction welded AZ31, it is necessary to consider the effect of work hardening.

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“…1) This means that grain refinement will be more beneficial when applied on magnesium alloys. Thus, great efforts focusing on the microstructural modifications of magnesium alloys have been made in order to enhance and control the mechanical performances.…”

Section: Introductionmentioning

confidence: 99%

Grain Size Dependence of Yield Strength in Randomly Textured Mg-Al-Zn Alloy

Wang

Huang

2007

Mater. Trans.

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The randomly textured Mg-Al-Zn alloy processed by electron beam welding typically exhibits clear grain size dependence of yield strength according to the Hall-Petch relationship: 0:2 ¼ 62 þ 202d À1=2 . The Schmid factor for the basal slip system was deduced to be around 0.031 in the randomly textured Mg alloys. The 0 in the Hall-Petch equation was theoretically calculated to be $ 65 MPa, which is reasonably consistent with the experimental data of $ 62 MPa.

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Strengthening mechanisms in the rapidly solidified AZ 91 magnesium alloy

Cited by 123 publications

References 4 publications

High Strain Rate and/or Low Temperature Superplasticity in AZ31 Mg Alloys Processed by Simple High-Ratio Extrusion Methods

High Strain Rate and/or Low Temperature Superplasticity in AZ31 Mg Alloys Processed by Simple High-Ratio Extrusion Methods

Microstructural Development in Friction Welded AZ31 Magnesium Alloy

Grain Size Dependence of Yield Strength in Randomly Textured Mg-Al-Zn Alloy

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