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Development of high strength Mg/Al bimetal by a novel ultrasonic vibration aided compound casting process
[Display omitted] •Ultrasonic vibration was used to enhance interface bonding of Mg/Al bimetal.•Mg2Si and Al12Mg17 phases and eutectic at the interface were remarkably refined.•Distribution of the Mg2Si phase at the interface become more uniform.•Continuous oxidation inclusions at the interface were...
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Published in: | Journal of materials processing technology 2022-02, Vol.300, p.117441, Article 117441 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | [Display omitted]
•Ultrasonic vibration was used to enhance interface bonding of Mg/Al bimetal.•Mg2Si and Al12Mg17 phases and eutectic at the interface were remarkably refined.•Distribution of the Mg2Si phase at the interface become more uniform.•Continuous oxidation inclusions at the interface were eliminated.•Bonding strength of Mg/Al bimetal was significantly increased by 86.5 %.
Ultrasonic vibration was proposed to enhance interface bonding of Mg/Al bimetal prepared by a novel lost foam compound casting (LFCC) to obtain high strength Mg/Al bimetal. The results showed that the interface of the Mg/Al bimetal without ultrasonic vibration was mainly composed of layer I (Al3Mg2 + Mg2Si), layer II (Al12Mg17 + Mg2Si), and layer III (Al12Mg17 + δ-Mg eutectic). Under the ultrasonic vibration, the Mg2Si and Al12Mg17 phases and the Al12Mg17 + δ-Mg eutectic at the interface were remarkably refined. After the ultrasonic vibration was applied, the Mg2Si phase was uniformly dispersed in the whole interface, and the continuous oxidation inclusion defect was eliminated. As a result, the microhardness of the entire interface became more uniform, and the shear strength of the Mg/Al bimetal significantly increased by 86.5 %, reaching 69 MPa, compared to the bimetal without ultrasonic vibration. The fracture surface of the Mg/Al bimetal without ultrasonic vibration exhibited an apparent brittle fracture morphology. Under the assist of the ultrasonic vibration, the shear strength of the bimetal was improved mainly due to the refinement of the interfacial microstructure, and the fracture surface of the Mg/Al bimetal generated a partial plastic deformation in the interface layer. |
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ISSN: | 0924-0136 1873-4774 |
DOI: | 10.1016/j.jmatprotec.2021.117441 |