| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Internal Friction Evidence on the Formation of Grain Boundary in Al Powder Sintering Process |
| HAO Gang-Ling1,2**, WANG Xin-Fu2, LI Xian-Yu1 |
1College of Physics and Electronic Information, Yan'an University, Yan'an 716000
2Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031
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| Cite this article: |
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HAO Gang-Ling, WANG Xin-Fu, LI Xian-Yu 2015 Chin. Phys. Lett. 32 026103 |
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Abstract The temperature dependence of internal friction is first investigated to understand the microstructure transition during the sintering process for the green compact of aluminum powder. An internal friction (IF) peak is observed only during the first heating process while not in the subsequent cooling and repeated heating process. The temperature position of the peak is independent of the measuring frequency and the height decreases with the increasing frequency. The appearance of the peak is closely related to the weak bonding interfaces between deformed aluminum particles and increased dislocation density induced by the pressing. The appearance of the peak well responds to a recrystallization process of deformed particles and thus the formation of the grain boundary which is proven by the appearance of the grain boundary IF peak. The peak temperature position is rationalized with the onset of the recrystallization process during the sintering process.
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Published: 20 January 2015
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| PACS: |
61.72.Hh
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(Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.))
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61.72.Mm
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(Grain and twin boundaries)
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81.20.Ev
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(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
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