Enhanced Ductility of a Fine‐Grained Mg–Gd–Al–Zn Magnesium Alloy by Hot Extrusion

Pourbahari, B.; Mirzadeh, Hamed; Emamy, M.; Roumina, R.

doi:10.1002/adem.201701171

Cited by 80 publications

(19 citation statements)

References 49 publications

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“…The relationship between tensile strength and elongation of various steel grades [3] and the results of the present study are shown, where the non-dual phase steels considered in the present work follow the conventional trend observed in the literature with tensile toughness (TS 3 El [30,31]) values of 20 000 MPa·% or lower, Figure 5. This is also the case for the dual phase steels originated from the spheroidized and full annealed initial microstructures (DP1, DP2, DP5, and DP6), Figure 5.…”

Section: Summary Of Tensile Propertiessupporting

confidence: 78%

Enhancement of work‐hardening behavior of dual phase steel by heat treatment

Nasiri

Mirzadeh

2018

Materialwissenschaft Werkst

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The work‐hardening response and mechanical properties of dual phase steels originated from different initial microstructures under low and high martensite volume fractions were investigated using a typical carbon‐manganese steel. The modified Crussard‐Jaoul analysis was used for studying the work‐hardening stages and the deformation behavior of ferrite and martensite. It was revealed that the initial martensitic microstructure before intercritical annealing is much better than the full annealed banded ferritic‐pearlitic and spheroidized microstructures in terms of work‐hardening capacity and strength‐ductility trade off. By increasing the amount of martensite, via intercritical annealing at higher temperatures, the ductility decreased but the tensile toughness of dual phase steels increased toward reaching the domain of extra‐advanced high‐strength steels due to the enhancement of work‐hardening rate.

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Section: Summary Of Tensile Propertiessupporting

confidence: 78%

Enhancement of work‐hardening behavior of dual phase steel by heat treatment

Nasiri

Mirzadeh

2018

Materialwissenschaft Werkst

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“…This results in the tardiness of the microcavity coalescence, which leads to deeper dimples. Deep dimples are indicative of high ductility of the material . Upon investigating the fracture surfaces of Fe‐31Ni‐0.1C alloy, Chawla et al found that the density of dimples increases by decreasing grain size, which is consistent with fracture surfaces of Figure for the AISI 304 stainless steel.…”

Section: Resultsmentioning

confidence: 72%

“…Tensile testing was carried out at room temperature by a computerized testing machine at the constant cross‐head speed of 1 mm min −1 to obtain engineering stress ( S )–engineering strain ( e ) curves. The values of work‐hardening rate were determined based on

d σ / d ε |_{i} = {σ_{i + 1} - σ_{i - 1}} / {ε_{i + 1} - ε_{i - 1}}

, where

σ = S (1 + e)

and

ε = \ln (1 + e)

are true stress and true strain (logarithmic strain), respectively. The instantaneous (incremental) work‐hardening exponent ( n ) based on the Hollomon equation (

σ = k ε^{n}

\ln σ = \ln k + n \ln ε

) was also considered.…”

Section: Methodsmentioning

confidence: 99%

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Naghizadeh

Mirzadeh

2019

steel research int.

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126

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Grain size effects on the properties of AISI 304 austenitic stainless steel are studied. Yield stress (YS) and ultimate tensile strength (UTS) increased with decreasing grain size (Hall–Petch law) while the difference between YS and UTS decreased. Three distinct stages for work‐hardening rate are identified: I) initial rapid fall until reaching a minimum value, II) subsequent rise to a maximum due to the transformation‐induced plasticity (TRIP) effect, which is found to enhance by increasing grain size, and III) final fall until the onset of necking. More in‐depth analysis on the mechanical stability of austenite reveals that for below‐average grain size of ≈50 μm, by decreasing grain size, the TRIP effect diminishes; whereas for grain size larger than ≈50 μm, by increasing grain size, the TRIP effect becomes less pronounced. Due to the strong TRIP effect, high incremental work‐hardening exponents (n‐values of higher than 0.8) and low‐yield ratios (smaller than 0.5) are observed. It is also found that when the average grain size increases, the tensile toughness and the size and depth of dimples increase. The latter is responsible for the tardiness of the microcavity coalescence, which is indicative of high ductility of this austenitic alloy.

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“…With increasing Al content from 1 to 4 wt%, the maximum intensity of basal texture of as‐extruded Mg – Al samples decreased from 8.91 to 5.29, which indicated that Al content could weaken the basal texture in magnesium alloys. She and Pourbahari also reported that the intensity of basal texture would decrease with increasing Al content. Decreasing grain size resulted in multi‐peak characteristics with greater orientation distribution of basal poles and then decreased the maximum basal texture intensity of as‐extruded Mg – Al alloy significantly.…”

Section: Resultsmentioning

confidence: 88%

Strain Hardening Behavior in Mg–Al Alloys at Room Temperature

et al. 2018

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The effect of Al on the strain hardening behavior of as-extruded Mg-xAl (x ¼ 1, 2, 3 and 4 wt%) magnesium alloys is investigated using uniaxial tensile tests at 10 À3 s À1 at room temperature. The strain hardening rate, the strain hardening exponent, and the hardening capacity are obtained from true stress-true plastic strain curves. In as-extruded Mg-Al alloys, the Al element is completely dissolved in the α-Mg matrix. With increasing Al content, the average grain sizes of these samples decrease from 16.9 to 10.7 mm. The strain hardening rate increases from 515 to 924 MPa, then reduces to 818 MPa at (σ-σ 0.2 ) ¼ 90 MPa. The strain hardening exponent n increases from 0.125 to 0.149 and then reduces to 0.142, while the hardening capacity Hc increases from 0.71 to 0.90 and then reduces to 0.80. The train hardening rate, the strain hardening exponent n, and hardening capacity Hc reach peak value in Mg-3Al. The difference in the strain hardening responses of asextruded Mg-Al alloys may mainly be influenced by weaker basal texture and smaller average grain size with increasing Al content.

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Enhanced Ductility of a Fine‐Grained Mg–Gd–Al–Zn Magnesium Alloy by Hot Extrusion

Cited by 80 publications

References 49 publications

Enhancement of work‐hardening behavior of dual phase steel by heat treatment

Enhancement of work‐hardening behavior of dual phase steel by heat treatment

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Strain Hardening Behavior in Mg–Al Alloys at Room Temperature

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