Strain rate sensitivity of binary Mg–Gd and Mg–Y solid solutions

Kula, A.; Jia, Xiang‐Meng; Mishra, Raja K.; Niewczas, M.

doi:10.1016/j.ijplas.2022.103321

Cited by 24 publications

(5 citation statements)

References 72 publications

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“…The V ⇤ in Al-Mn, Al-Mn-Si alloys, and Al is decreasing with the flow stress (Fig. 9), which is a typical behaviour observed in metals, associated with the evolution of the dislocation microstructure during plastic deformation [33,37,39]. The absolute V ⇤ values are much higher at 298K than at 78K, indicating di↵erent ratecontrolling processes determine plastic flow at two temperatures.…”

Section: Rate-controlling Mechanismsmentioning

confidence: 75%

“…The apparent activation distance, d, and work done by the applied stress during thermal activation, W ⇤ , have been used to characterize the obstacles for glide dislocations [32,33]. If l is the average spacing between thermally activatable obstacles, and l is changing with the stress as l = M ↵µb , the apparent activation distance is given as (Eq.11),…”

Section: Kinematics Of Plastic Deformation and Work Hardeningmentioning

confidence: 99%

“…On the other hand, obstacles that are athermal move the Haasen plot down and produce the positive intercept with the stress axis [30,31,34,36]. Experimental studies show that the response from the thermal obstacles contributing to the flow stress can be observed for solution-strengthened alloys [33,37,38,39], while athermal obstacles are usually recorded in precipitation-hardened systems [36].…”

Section: Kinematics Of Plastic Deformation and Work Hardeningmentioning

confidence: 99%

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Plasticity of solid solution Al-Mn and Al-Mn-Si alloys

Kula,

Holmedal,

Niewczas

2024

Materials Science and Engineering: A

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Section: Rate-controlling Mechanismsmentioning

confidence: 75%

Section: Kinematics Of Plastic Deformation and Work Hardeningmentioning

confidence: 99%

Section: Kinematics Of Plastic Deformation and Work Hardeningmentioning

confidence: 99%

See 1 more Smart Citation

Plasticity of solid solution Al-Mn and Al-Mn-Si alloys

Kula,

Holmedal,

Niewczas

2024

Materials Science and Engineering: A

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“…In order to promote their applicability across a variety of fields, researchers have focused on developing high-strength magnesium alloys [ 5 , 6 , 7 , 8 ]. In general, the rare earth (RE) element Gd has been widely used in the alloying of magnesium alloys, and Mg-Gd magnesium alloys are characterized as typical Mg-RE magnesium alloys [ 9 , 10 , 11 ]. In order to achieve higher mechanical properties, other RE elements, such as Y, Nd, and Ce, are usually added to Mg-Gd magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zn Addition on the Microstructure, Mechanical Properties, and Fracture Behavior of As-Cast Mg-Gd-Y-Zr Alloys

Xia

Yang

2023

Materials

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The microstructure and mechanical properties of semi-continuous casting Mg-Gd-Y-Zr magnesium alloys with different Zn contents were studied in this paper. The results showed that an increase in Zn content resulted in gradual refinement of the grains and a gradual increase in the volume fraction of the second phase. At a Zn content of 0.7 wt%, the microstructure was mainly composed of the α-Mg matrix and the Mg5(GdY) and long-period stacking order (LPSO) phases. An increase in the Zn content lowered the volume fraction of the Mg5(GdY) phase and increased the volume fraction of the LPSO phase. At a Zn content of 3.3 wt%, the microstructure was mainly composed of the α-Mg matrix and the LPSO phase. Among these alloys, the alloy without Zn addition showed an optimal ultimate tensile strength and yield strength of 229 MPa and 185 MPa, respectively, while the alloy with 3.3 wt% Zn showed an excellent elongation after fracture of 4.5%. The tensile fracture analysis indicated that the cracks of the alloy without Zn mainly originated at the trigeminal junction of the grain boundary, the cracks of the 0.7 wt% Zn and 1.5 wt% Zn alloy mainly originated at the interface of the Mg/lamellar LPSO phase, and the cracks of the 3.3 wt% Zn alloy mainly originated at the bulk LPSO phase of the grain boundary and then propagated along the bulk LPSO phase.

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“…At the same time, Mg has a very low density, i.e., about 33.6% lighter than Al and Ti, and 75% lighter than steel [2]. Mg is strengthened by additives [3][4][5], heat, and plastic treatment [6], e.g., ECAP technology [7,8]. Numerous alloys are formed based on a Mg matrix, and the most frequently tested magnesium alloys include AZ31, ZE41, AZ61, AM60, AZ61, AZ80, and AZ91 [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Research of FSW Joints of AZ91 Magnesium Alloy

et al. 2023

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For the friction stir welding (FSW) of AZ91 magnesium alloy, low tool rotational speeds and increased tool linear speeds (ratio 3.2) along with a larger diameter shoulder and pin are utilized. The research focused on the influence of welding forces and the characterization of the welds by light microscopy, scanning electron microscopy with an electron backscatter diffraction system (SEM-EBSD), hardness distribution across the joint cross-section, joint tensile strength, and SEM examination of fractured specimens after tensile tests. The micromechanical static tensile tests performed are unique and reveal the material strength distribution within the joint. A numerical model of the temperature distribution and material flow during joining is also presented. The work demonstrates that a good-quality joint can be obtained. A fine microstructure is formed at the weld face, containing larger precipitates of the intermetallic phase, while the weld nugget comprises larger grains. The numerical simulation correlates well with experimental measurements. On the advancing side, the hardness (approx. 60 HV0.1) and strength (approx. 150 MPa) of the weld are lower, which is also related to the lower plasticity of this region of the joint. The strength (approx. 300 MPa) in some micro-areas is significantly higher than that of the overall joint (204 MPa). This is primarily attributable to the macroscopic sample also containing material in the as-cast state, i.e., unwrought. The microprobe therefore includes less potential crack nucleation mechanisms, such as microsegregations and microshrinkage.

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Strain rate sensitivity of binary Mg–Gd and Mg–Y solid solutions

Cited by 24 publications

References 72 publications

Plasticity of solid solution Al-Mn and Al-Mn-Si alloys

Plasticity of solid solution Al-Mn and Al-Mn-Si alloys

Effect of Zn Addition on the Microstructure, Mechanical Properties, and Fracture Behavior of As-Cast Mg-Gd-Y-Zr Alloys

Comprehensive Research of FSW Joints of AZ91 Magnesium Alloy

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