Mechanical Properties of Fine-Grained Magnesium Alloys Processed by Severe Plastic Forging

Sakai, Taku; Miura, Hiromi

doi:10.5772/13183

Cited by 5 publications

(5 citation statements)

References 44 publications

(56 reference statements)

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“…This is consistent with the study of Ion et.al., where it can be seen that the peak strain increases with increasing temperature when there is extensive twinning at low temperature (423 K and 533 K) [25]. The same phenomenon was also found in the investigation of Sakai et.al in as-annealed AZ31, in which the curves showed twinning features, and therefore the peak strain did not vary with increasing temperature from 473 K to 523 K [26]. The amount of precipitates increased with decreasing temperature, suggesting that there will be a stronger effect on retarding DRX at lower temperatures.…”

Section: Discussionsupporting

confidence: 74%

Effect of dynamic precipitation and twinning on dynamic recrystallization of micro-alloyed Mg–Al–Ca alloys

Kaboli

Kabir

et al. 2013

Materials Science and Engineering: A

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Section: Discussionsupporting

confidence: 74%

Effect of dynamic precipitation and twinning on dynamic recrystallization of micro-alloyed Mg–Al–Ca alloys

Kaboli

Kabir

et al. 2013

Materials Science and Engineering: A

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“…Refining and homogeneous distribution of the recrystallized grains and increasing the dislocation density after the SPD process results in a remarkable increase in the strength [33]. The primary reason for the poor mechanical properties of the as-cast AZ91 is the inhomogeneous distribution of the β phase precipitates at the grain boundaries [23].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructure and mechanical properties of fine-grained thin-walled AZ91 tubes processed by a novel combined SPD process

et al. 2017

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A combination of parallel tubular channel angular pressing (PTCAP) and tube backward extrusion (TBE) as a novel combined severe plastic deformation (SPD) was applied on AZ91 alloy to produce ultrafine-grained (UFG) thinwalled tubes. The effects of combined SPD process were investigated on the microstructure refinement and mechanical properties. Also, hydro-bulge test was carried out to reveal the mechanical properties. The results showed a notable increase in ultimate strength, yield strength and microhardness of the thin-walled UFG tube were achieved compared to that from PTCAP process. A remarkable grain refinement achieved. Applying three-passes-combined process refine the grain size to 8.8 μm from an initial value of ∼150 μm. For one pass-and two passes-processed thin-walled tubes, it was about 12.4 and 9.8 μm, respectively. Yield and ultimate strengths were increased notably to 150 and 354 MPa for 2P+TBE tube, from the initial values of 86 and 166 MPa, respectively. The maximum microhardness was increased to about 105 Hv for the 2P+TBE tube from the initial value of 56 Hv. Hydro-bulge test showed that the bursting pressure increased to 246 bar for 2 passes-thin-walled tube from the initial value of 160 bar. It was 220 and 195 bar for 1 pass-and 3 passes-thin-walled tubes, respectively.

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“…It is well known in Mg alloys [10,21,22] that UFGs are developed at along original grain boundaries at low strains and expand to grain interiors through the dynamic formation of kink bands, one kind of deformation bands (DBs)formed during hot deformation. Thus the formation of UFGs in Mg alloys can take place in-situ in segments fragmented by DBs and then be controlled by a series of strain-induced continuous reaction, i.e.…”

Section: ))mentioning

confidence: 99%

“…4 (d)), equiaxed UFGs are almost fully developed in a whole volume. It is well known[10,21,22,23,24] that DBs are frequently formed in the Mg alloys during high temperature compression owing to its intrinsic anisotropic…”

mentioning

confidence: 99%

Effect of heat treatment on dynamic recrystallization behaviors and mechanical properties of Mg–2.7Nd–0.5Zn–0.8Zr alloy

Zhang

Yang

Fang

et al. 2016

Materials Science and Engineering: A

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The fine-grained structure development and the resultant mechanical properties during/after hot deformation were investigated in a Mg-2.7Nd-0.5Zn-0.8Zr alloy pretreated in solution and subsequently full aging. The true stress-true strain flow curves show a two-step work hardening during hot compression due to the interactions between dislocations and Mg-Nd precipitates as well as Zn-Zr intermetallics. In as-aging (AA) sample containing statically precipitated particles (SPPs), deformation bands (DBs) are easily developed at low strains and then ultrafine grains (UFGs) are evolved at along the boundaries of DBs and original grains at medium strains and rapidly approaches to a full development of final stable UFGs as the strain goes higher. In as-solution (AS) sample, by contrast, equiaxial UFGs are partially developed even in high strain and the grain sizes are smaller attributed to dynamic precipitated particles (DPPs). Tensile tests were carried out at ambient temperature for both types of sample, the results show that the tensile elongation to fracture of the hot deformed AA sample is higher than that of the AS one, because the former has a higher volume fraction and a weaker texture of UFGs developed. Besides, the AA sample contains a higher 5 % proof strength compared

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Mechanical Properties of Fine-Grained Magnesium Alloys Processed by Severe Plastic Forging

Cited by 5 publications

References 44 publications

Effect of dynamic precipitation and twinning on dynamic recrystallization of micro-alloyed Mg–Al–Ca alloys

Effect of dynamic precipitation and twinning on dynamic recrystallization of micro-alloyed Mg–Al–Ca alloys

Microstructure and mechanical properties of fine-grained thin-walled AZ91 tubes processed by a novel combined SPD process

Effect of heat treatment on dynamic recrystallization behaviors and mechanical properties of Mg–2.7Nd–0.5Zn–0.8Zr alloy

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