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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 3    March 2021

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Influence of B4C particle size on microstructure and damping capacities of (B4C+Ti)/Mg composites
YAO Yan-tao(姚彦桃)1, CHEN Li-qing(陈礼清)2, WANG Wen-guang(王文广)3

1. School of Environmental and Safety Engineering, Liaoning Petrochemical University,Fushun 113001, China;
2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;
3. School of Mechanical Engineering, Liaoning Petrochemical University, Fushun 113001, China

Abstract:To study the influence of B4C particle size on the microstructure and damping capacities of (B4C+Ti)/Mg composites, in situ reactive infiltration technique was utilized to prepare Mg-matrix composites. The microstructure, produced phases and damping capacities of the composites prepared with different particle size of B4C were characterized and analyzed. The results show that the reaction between B4C and Ti tends to be more complete when finer B4C particle was used to prepare the composites. But the microstructure of the as-prepared composites is more homogenous when B4C and Ti have similar particle size. The strain-dependent damping capacities of (B4C+Ti)/Mg composites improve gradually with the increase of strain amplitude, and composites prepared with coarser B4C particles tend to have higher damping capacities. The temperature-dependent damping capacities improve with increasing the measuring temperatures, and the kind of damping capacities of the composites prepared with 5 mm B4C are inferior to those of coarser particles. The dominant damping mechanism for the strain-damping capacity is dislocation damping and plastic zone damping, while that for the temperature-damping capacity is interface damping or grain boundary damping.

 

Key words: Mg-matrix composites; in situ reactive infiltration; particle size; microstructure; damping capacity; mechanism

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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