Microstructure and Mechanical Properties of Mg/Al Clad Bars with Ni Interlayer Processed by Compound Castings and Multi-Pass Caliber Rolling
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Microstructure and Microhardness of the As-Cast Composites
3.2. Characterization after Warm Caliber Rolling
3.3. Microstructural Evolution of Interface
3.4. Microhardness Evolution of Caliber Rolled Composites
4. Discussion
5. Conclusions
- (1)
- The formation of Mg-Al intermetallic phases was impeded effectively by the Ni interlayer, and a well bonded AZ31/Ni/6061 multilayer structure was formed at the interface during the compound casting process. Increasing the pouring temperature resulted in the reaction between Ni and base alloys and the formation of a thick reaction layer composing of complex Mg-Al-Ni intermetallic compounds.
- (2)
- The strain in the AZ31 and 6061 base alloys was inhomogeneous during the caliber rolling process, mainly being concentrated on and around the clad AZ31 alloy during the initial passes, and subsequently introduced into the center with increasing number of passes. The deformation of the AZ31 and 6061 alloys tended to be equivalent after 15-pass rolling.
- (3)
- The continuous Ni interlayer fabricated by plasma spraying was fragmented in the subsequent rolling process. With increasing strain, the Ni particle fragments became smaller and uniform. Meanwhile, the fresh AZ31 and 6061 base alloys squeezed out and bonded together under the rolling force. After 15-pass rolling, the hard Ni interlayer transformed into the dispersed particles at the interface and a well-bonded interface with no visible defects was formed.
Author Contributions
Funding
Conflicts of Interest
References
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Alloys | Element Content (wt. %) | ||||||
---|---|---|---|---|---|---|---|
Al | Zn | Mn | Si | Cu | Fe | Mg | |
AZ31 | 2.91 | 0.88 | 0.42 | 0.01 | 0.01 | 0.02 | Bal. |
6061 | Bal. | 0.2 | 0.13 | 0.48 | 0.15 | 0.58 | 0.92 |
Spectrum | Percentage Composition (at. %) | ||
---|---|---|---|
Mg | Al | Ni | |
1 | – | 75.11 | 24.89 |
2 | 70.95 | 29.05 | – |
3 | 58.46 | 34.34 | 7.2 |
4 | 2.37 | 85.48 | 12.16 |
5 | 39.97 | 60.03 | – |
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Chen, L.; Fu, Y.; Yin, F.; Liu, N.; Liang, C. Microstructure and Mechanical Properties of Mg/Al Clad Bars with Ni Interlayer Processed by Compound Castings and Multi-Pass Caliber Rolling. Metals 2018, 8, 704. https://doi.org/10.3390/met8090704
Chen L, Fu Y, Yin F, Liu N, Liang C. Microstructure and Mechanical Properties of Mg/Al Clad Bars with Ni Interlayer Processed by Compound Castings and Multi-Pass Caliber Rolling. Metals. 2018; 8(9):704. https://doi.org/10.3390/met8090704
Chicago/Turabian StyleChen, Lu, Ying Fu, Fuxing Yin, Ning Liu, and Chunyong Liang. 2018. "Microstructure and Mechanical Properties of Mg/Al Clad Bars with Ni Interlayer Processed by Compound Castings and Multi-Pass Caliber Rolling" Metals 8, no. 9: 704. https://doi.org/10.3390/met8090704