The creep behavior of Mg–9Al–1Si–1SiC composite at elevated temperature

Zhou, Pengwen; Zhang, Shaoxiong; Li, Ming; Wang, Hongxia; Cheng, Weili; Wang, Lifei; Li, Hang; Liang, Wei; Liu, Yiming

doi:10.1016/j.jma.2019.06.004

Cited by 21 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fitted value of the creep stress exponent ( n ) was 4.4, which suggested the steady creep stage of the experimental alloy at 250 °C under 50–80 MPa was dominated by the dislocation climb mechanism. [ 5,24,25 ] To further reveal the mechanism of creep deformation, TEM characterization was used to examine the dislocation configurations in the specimen crept for 40 h at 250 °C under 80 MPa. Figure shows the TEM bright field with the incident electron beam approximately parallel to the

[2 \overset{1}{true} \overset{1}{true} 0]

zone axis.…”

Section: Resultsmentioning

confidence: 99%

Tensile Creep Behavior and Microstructure Evolution of As‐Cast Mg–9.82Gd–0.38Zr Alloy at 250 °C

Qin

Yang

Zhang

et al. 2021

Physica Status Solidi (a)

View full text Add to dashboard Cite

Herein the tensile creep behavior and microstructure evolution of an as‐cast Mg–9.82Gd–0.38Zr alloy under different stresses at 250 °C are investigated. The results of creep test show that the creep strain and steady creep rate increase with the creep stress at 250 °C. The fitted stress exponent n value (4.4) and transmission electron microscopy analysis suggest that the steady creep is dominated by the dislocation climb and glide mechanisms together. At the primary stage, due to the segregation of the Gd content, a fine‐strengthening β′ phase precipitates near the α‐Mg grain boundary. Then the transformation of β′ precipitates to a needle‐like β phase, coarsening, and growth of the β phase toward the intragranular direction gradually deteriorate the creep resistance of the experimental alloy. Moreover, two kinds of precipitate‐free zones (PFZs) appear at the end of the secondary creep stage and the PFZs nearly perpendicular to the applied stress direction widen gradually because of the directional diffusion. The nucleation and propagation of creep crack along the cracked eutectic phase and PFZs lead to the greatly rising creep rate at the end of the tertiary creep stage, which eventually results in the intergranular creep fracture of the experimental alloy.

show abstract

[2 \overset{1}{true} \overset{1}{true} 0]

zone axis.…”

Section: Resultsmentioning

confidence: 99%

Tensile Creep Behavior and Microstructure Evolution of As‐Cast Mg–9.82Gd–0.38Zr Alloy at 250 °C

Qin

Yang

Zhang

et al. 2021

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

“…According to the above results in this paper, the addition of the whiskers can greatly improve the creep resistance of the composite but do not fully explain the abnormally low creep rate of the composite compared to the matrix ( Figure 2 ). The existence of rigid reinforcement undertook most of the applied load, which made the creep resistance of the composite increase [ 32 , 33 ]. The load-transfer mechanism can now be examined for this phenomenon.…”

Section: Resultsmentioning

confidence: 99%

Elevated Temperature Tensile Creep Behavior of Aluminum Borate Whisker-Reinforced Aluminum Alloy Composites (ABOw/Al–12Si)

Yuan

Zhang

et al. 2021

Materials

View full text Add to dashboard Cite

In order to evaluate the elevated temperature creep performance of the ABOw/Al–12Si composite as a prospective piston crown material, the tensile creep behaviors and creep fracture mechanisms have been investigated in the temperatures range from 250 to 400 °C and the stress range from 50 to 230 MPa using a uniaxial tensile creep test. The creep experimental data can be explained by the creep constitutive equation with stress exponents of 4.03–6.02 and an apparent activation energy of 148.75 kJ/mol. The creep resistance of the ABOw/Al–12Si composite is immensely improved by three orders of magnitude, compared with the unreinforced alloy. The analysis of the ABOw/Al–12Si composite creep data revealed that dislocation climb is the main creep deformation mechanism. The values of the threshold stresses are 37.41, 25.85, and 17.36 at elevated temperatures of 300, 350 and 400 °C, respectively. A load transfer model was introduced to interpret the effect of whiskers on the creep rate of this composite. The creep test data are very close to the predicted values of the model. Finally, the fractographs of the specimens were analyzed by Scanning Electron Microscope (SEM), the fracture mechanisms of the composites at different temperatures were investigated. The results showed that the fracture characteristic of the ABOw/Al–12Si composite exhibited a macroscale brittle feature range from 300 to 400 °C, but a microscopically ductile fracture was observed at 400 °C. Additionally, at a low tensile creep temperature (300 °C), the plastic flow capacity of the matrix was poor, and the whisker was easy to crack and fracture. However, during tensile creep at a higher temperature (400 °C), the matrix was so softened that the whiskers were easily pulled out and interfacial debonding appeared.

show abstract

“…Consequently, in the last decade, scientists have been searching options to improve the creep resistance of Mg using alloying with non‐RE elements and with the development of composites reinforced by ceramic particles such as SiC. [ 15,20 ]…”

Section: Introductionmentioning

confidence: 99%

Effects of Y Additions on the Microstructures and Mechanical Behaviours of as Cast Mg–xY–0.5Zr Alloys

et al. 2022

View full text Add to dashboard Cite

show abstract

The creep behavior of Mg–9Al–1Si–1SiC composite at elevated temperature

Cited by 21 publications

References 31 publications

Tensile Creep Behavior and Microstructure Evolution of As‐Cast Mg–9.82Gd–0.38Zr Alloy at 250 °C

Tensile Creep Behavior and Microstructure Evolution of As‐Cast Mg–9.82Gd–0.38Zr Alloy at 250 °C

Elevated Temperature Tensile Creep Behavior of Aluminum Borate Whisker-Reinforced Aluminum Alloy Composites (ABOw/Al–12Si)

Effects of Y Additions on the Microstructures and Mechanical Behaviours of as Cast Mg–xY–0.5Zr Alloys

Contact Info

Product

Resources

About