Synthesis of AA7075-AA7075/B4C bilayer composite with enhanced mechanical strength via plasma activated sintering

Wu, Chuandong; Wu, Jialu; Ma, Kun; Zhang, Dalong; Xiong, Shuya; Zhang, Jian; Luo, Guoqiang; Chen, Fei; Shen, Qiang; Lavernia, Enrique J.

doi:10.1016/j.jallcom.2017.01.065

Cited by 19 publications

(5 citation statements)

References 73 publications

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“…Therefore, it is important to improve the accuracy of predictions on porosity gradients. Other applications that can benefit from this microstructural gradation includes cutting materials for heat spreading while retaining strength, and impact resistant materials …”

Section: Resultsmentioning

confidence: 99%

Prediction of continuous porosity gradients in ceramics using ZnO as a model material

et al. 2018

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Materials with gradient microstructures have a wide range of applications such as cutting tools, armor, and electronic devices. However, it is difficult to predict and control the gradient microstructure during processing. In the present work, a continuous porosity gradient was successfully achieved in ZnO material via spark plasma sintering with a large induced thermal gradient. The porosity is overestimated if isothermal prediction is applied. The current work proposed a more accurate prediction of the porosity by considering the stress-shielding effect caused by the thermal gradient. The shielding effect results from different stress states in the sample due to differential sintering: the hotter side of the specimen experiences a higher strain rate and more shrinkage while the colder side experiences a lower strain rate and less shrinkage simultaneously. Therefore, the axial strains are varied throughout the sample thickness. Using the constituent equations in advanced sintering analysis, the shield stress was calculated to be approximately 13 MPa for the viscoelastic assumption of sintering. To improve the accuracy of predicting porosity gradient, it is necessary to add a load to overcome the shield stress when the materials are sintered with a thermal gradient. K E Y W O R D Sporosity gradient, prediction of microstructure, spark plasma sintering

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Section: Resultsmentioning

confidence: 99%

Prediction of continuous porosity gradients in ceramics using ZnO as a model material

et al. 2018

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“…Figure 5 shows GP zones, platelet η′ and plate-like η′ that were identified via high resolution TEM as well as their morphology, size, and structural coherency with the Al matrix according to published studies 15 , 16 , 34 , 38 . The spherical GP zones with dark contrast are observed in the area.…”

Section: Resultsmentioning

confidence: 99%

Precipitation phenomena in Al-Zn-Mg alloy matrix composites reinforced with B4C particles

Zhang

et al. 2017

Sci Rep

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To provide insight into precipitation phenomena in age-hardening Al-Zn-Mg(-Cu) matrix composites, an Al 7075 alloy composite reinforced with B4C particles was selected as a model system. The bulk composites were fabricated via plasma activated sintering and followed by a peak aged (T6) heat treatment. Two types of Al matrix zones were identified in the composite: (1) the regions in the vicinity of the matrix/reinforcement interface, defined as “matrix plastic zone” (MPZ) hereafter, and (2) the regions away from the matrix/reinforcement interface, simply defined as matrix hereafter. The precipitation behavior in the MPZ was characterized and compared to that in the matrix. The MPZ contained a high density of dislocations. The number density of GP zones in the MPZ is lower than that in the matrix while the average size of the GP zones in MPZ is coarser. In addition, semi-coherent platelet η′ precipitates were observed but only in the MPZ. The dislocations and the Al/B4C interfaces provide more heterogeneous nucleation sites for the η′ precipitates in the MPZ. The growth and coarsening of the η′ precipitates caused rapid depletion of Mg and Zn solute atoms in the MPZ.

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“…The interface between the different layers is clear and visible from a macro perspective of the Al-B 4 C/Al laminated composites section shown in Figure 2 (based on the distinct darkness difference between 6061Al and 15 vol.% B 4 C/6061Al). However, the interface between the B 4 C/Al layer and Al layer is not integrated nor continuous from a micro perspective in Figure 5b, which exhibits an alternative arrangement of the B 4 C particles and Al matrix [23,27,31]. The interface morphology is different from the same straight and continuous interfaces of the metal laminated composites [1,9,11,14].…”

Section: Interfacial Microstructure Of Al-b 4 C/al Laminated Compositesmentioning

confidence: 94%

“…Some preparation methods, such as spark plasma sintering [19], pressure infiltration [20], stir casting [21], and hot-pressing sintering [22], are used to produce laminated PRMMCs. Wu et al synthesized the AA7075-AA7075/B 4 C bilayer composite via plasma activated sintering and found no interfacial cracks or delamination were observed under bend testing conditions [23]. Excellent bonding between the different layers of functionally graded AA7075-B 4 C composite with multi-layer gradient structure was also obtained [24,25].…”

Section: Introductionmentioning

confidence: 99%

Influence of Interface on Mechanical Behavior of Al-B4C/Al Laminated Composites under Quasi-Static and Impact Loading

Zhang,

Chao,

Jiang

et al. 2023

Materials

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In this study, Al-B4C/Al laminated composites with high interlayer bonding strength were fabricated by integrated hot-pressed sintering accompanied with hot rolling. The mechanical properties and interface behavior of the Al-B4C/Al laminated composites were investigated under quasi-static and impact loading. The results show that the Al-B4C/Al laminated composites obtain a high interface bonding strength, because no interlayer delamination occurs even after fractures under quasi-static and impact loads. The Al-B4C/Al laminated composites exhibit a better comprehensive mechanical performance, and the fracture can be delayed due to the high bonding strength interface. Moreover, laminated composites can absorb more impact energy than the monolithic material under impact loading due to the stress transition and relaxation.

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Synthesis of AA7075-AA7075/B4C bilayer composite with enhanced mechanical strength via plasma activated sintering

Cited by 19 publications

References 73 publications

Prediction of continuous porosity gradients in ceramics using ZnO as a model material

Prediction of continuous porosity gradients in ceramics using ZnO as a model material

Precipitation phenomena in Al-Zn-Mg alloy matrix composites reinforced with B4C particles

Influence of Interface on Mechanical Behavior of Al-B4C/Al Laminated Composites under Quasi-Static and Impact Loading

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