[1] Sun Yu, Chen Jin, Sun Guoxiong, et al. Variation of the second-phase morphology and its influenceon fracture behavior of Al-Si alloy [J]. Journal of Southeast University (English Edition), 2004, 20 (1): 53-58. [doi:10.3969/j.issn.1003-7985.2004.01.011]

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Variation of the second-phase morphology and its influenceon fracture behavior of Al-Si alloy()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

20

Issue:

2004 1

Page:

53-58

Research Field:

Materials Sciences and Engineering

Publishing date:

2004-03-30

Info

Title:

Variation of the second-phase morphology and its influenceon fracture behavior of Al-Si alloy

Author(s):

Sun Yu¹;  2;  Chen Jin¹;  Sun Guoxiong¹

¹Department of Materials Science and Engineering, Southeast University, Nanjing 210096, China
²Department of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224002, China

Keywords:

Al-Si alloy;  variation of Si phase;  mechanical properties;  fracture behavior

PACS:

TG146.2+1;TG146.4+5

DOI:

10.3969/j.issn.1003-7985.2004.01.011

Abstract:

Using an optical microscope and scanning electron microscope(SEM), the variation of eutectic Si morphology of Al-Si alloy in solution treatment was observed to study its influence on mechanical properties and fracture behavior. The results show that eutectic Si undergoes stubbing, necking, fragmentation, and growth in the initial stage(250 min); in the middle solution stage(250 to 400 min), the eutectic Si morphology has no significant change, only the degree of spheroidizing becomes higher; after 600 min, the growth of eutectic Si is a coarsening process controlled by diffusion and follows the Liftshitz-Slyozov-Wangner(LSW)model, and the eutectic Si morphology deteriorates due to the occurrence of facets and lap. Based on the quantitative measure and regression analysis, the eutectic Si morphology has a remarkable influence on mechanical properties and fracture behavior.

References:

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Memo

Memo:

Biographies: Sun Yu(1963—), male, graduate, associate professor; Sun Guoxiong(corresponding author), male, professor, gxsun@seu.edu.cn.

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