维普中文期刊产品整合服务

Characterization of high-pressure die-cast hypereutectic Al-Si alloys based on microstructural distribution and fracture morphology

查看全文 作　　者：X.Y. [1]Jiao;J. [1]Wang;C.F. [1]Liu;Z.P. [1,2]Guo;G.D. [3]Tong;S.L. [3]Ma;Y. [3]Bi;Y.F. [3]Zhang;S.M. [1,2]Xiong 高影响力作者 机构地区：[1]School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;[2]State Key Laboratory of Automobile Safety and Energy, Tsinghua University, Beijing, China;[3]China FAW Foundry Co., Ltd., Changchun 130011. China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第6期,共9页高影响力期刊 基　　金：the National Natural Science Foundation of China (Grant No. 51775297);the National Science and the Tsinghua University Initiative Scientific Research Program (No. 20151080370);UK Royal Academy of Engineering/Royal Society through the Newton International Fellowship Scheme for financial support 摘　　要：The fracture behavior of high-pressure die-cast hypereutectic(HPDC) Al-Si alloys was investigated using a high-resolution laboratory CT and synchrotron X-ray tomography with a particular focus on the influence of HPDC microstructure. Results showed that microstructure of the alloy was mainly comprised of primary silicon particles(PSPs), Al dendrites, Cu-rich phases and pores. Most of the coarse PSPs, Cu-rich phases and pores were located in the center of the specimen. The rapid solidification of HPDC led to a heterogeneous microstructural feature. Elemental Cu was enriched in the frontiers of solid-liquid interface, causing the formation of large size dendritic arms. The pores were formed in the interdendrites which endured high stress intensity under high applied stress. Microcracks were originated from pores and further connected Cu-rich phases causing intergranular fracture. PSPs worked as obstacles causing piling-up dislocations in the phase interface. In the regions where large size of PSPs enriched in, PSPs ruptured rather than debonded from matrix, indicating transgranular fractures of PSPs. Microcracks originated around pores and PSPs tended to converge on the main cracks to decrease the energy required for crack propagation. 关 键 词：HYPEREUTECTIC AL-SI alloy Primary silicon particles POROSITY Fracture morphology High pressure die CASTING
相关文献

参考文献(36)

引证文献(4)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费