Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/60956
Title: Mn segregation dependence of damping capacity of as-cast M2052 alloy
Authors: Zhong, Z
Liu, W
Li, N
Yan, J
Xie, J
Li, D
Liu, Y
Zhao, X
Shi, S 
Keywords: Ageing
Casting
Internal friction
Non-ferrous alloys
Phase transformation
Spinodal decomposition
Issue Date: 2016
Publisher: Elsevier
Source: Materials science and engineering. A, Structural materials : properties, microstructure and processing, 2016, v. 660, p. 97-101 How to cite?
Journal: Materials science and engineering. A, Structural materials : properties, microstructure and processing 
Abstract: In this paper, three types of sand-casting M2052 alloys subjected to different heat treatments have been designed and prepared in order to investigate the relationship between Mn segregation and damping capacity using dynamic mechanical analysis, optical microscopy, X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. The results show that damping capacity has a crucial dependence on the Mn segregation in as-cast M2052 alloy. The original as-cast alloy without subsequent heat treatment shows its internal friction (Q-1) is 1.52×10-2 at a strain amplitude of γ=2×10-4, while a remarkable enhancement (2.6×10-2) of Q-1 can be obtained by ageing of the as-cast alloy at 435 °C for 4 h. This is mainly ascribed to the further formation of nanoscale Mn segregation in the Mn dendrites (so-called Mn macrosegregation) by spinodal decomposition during the ageing. On the contrary, performing the additional homogenization treatment at 850 °C for 24 h prior to the ageing at 435 °C for 4 h for the as-cast M2052 alloy can result in the obvious reduction of damping capacity (only 6.5×10-3 for Q-1), which is closely associated with the distinct decrement of lattice distortion of γ'-Mn during f.c.c-f.c.t phase transformation caused by weakening of Mn segregation at the macro/nano-scale.
URI: http://hdl.handle.net/10397/60956
ISSN: 0921-5093
EISSN: 1873-4936
DOI: 10.1016/j.msea.2016.02.084
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