The effects of TiB2 on segregation bands, porosities and mechanical properties of hypoeutectic Al-Si alloys by high pressure die-casting

被引：1
作者：
Liu, Lei [1 ]
Yang, Weixiao [1 ]
Zhao, Kai [1 ]
Zhang, Tao [3 ]
Jiang, Biao [4 ]
Zhang, Zhirou [1 ]
Guo, Enyu [1 ,2 ]
Kang, Huijun [1 ,2 ]
Chen, Zongning [1 ,2 ]
Pan, Lingling [3 ]
Wang, Tongmin [1 ,2 ]
机构：
[1] Dalian Univ Technol, Sch Mat Sci & Engn, Key Lab Solidificat Control & Digital Preparat Tec, Dalian 116024, Peoples R China
[2] Dalian Univ Technol, Ningbo Inst, Ningbo 315000, Peoples R China
[3] Shenzhen Leadwell Technol Co Ltd, Shenzhen 518110, Peoples R China
[4] Hunan Xiangtou Goldsky Titanium Met Co Ltd, Changsha 410205, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2025年 / 221卷
基金：
中国国家自然科学基金;
关键词：
High pressure die casting; Non-heat-treated aluminum alloy; Segregation band; Porosity; TiB2; GRAIN-REFINEMENT; MICROSTRUCTURE; CRYSTALS; MN; CU;
D O I：
10.1016/j.matchar.2025.114741
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The hypoeutectic Al-Si-Mn-Mg alloys are often used as the self-hardening materials exempt of solution treatment by high pressure die casting (HPDC) to fabricate net-shape giga vehicle components. In this work, Al10SiMnMg and Al7SiMnMg alloys were comparatively studied to explore the effects of TiB2 addition on the evolution of segregation bands and porosities in HPDC. The results demonstrate that the effects of TiB2 addition can be divided into two-fold. On the one hand, it can significantly increase the area fraction of the externally solidified crystals (ESCs) which formed in shot sleeve; on the other hand, it refines the alpha-Al grains nucleated in die cavity ((alpha-Al)II grains). Such duplex effects greatly affect the rheological behavior of semisolid alloy in die cavity that the former one is apt to increase the shrinkage level and the latter one is conducive to the decrease of porosity. The microstructural observation confirms that the segregation band becomes blurred and the porosity is reduced in the Al10SiMnMg alloy, while the segregation band even diminish below detection and large shrinkage appears in the Al7SiMnMg alloy. Accordingly, the mechanical properties of the Al10SiMnMg alloy can be improved, while those of the Al7SiMnMg alloy are impaired after adding TiB2. This study provides a novel insight into the control of defects in HPDC.
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页数：14
相关论文
共 45 条
[1]   Mechanisms of gas and shrinkage porosity formation in solidifying shear bands [J].
Bhagavath, Shishira ;
Gong, Zhixuan ;
Wigger, Tim ;
Shah, Saurabh ;
Ghaffari, Bita ;
Li, Mei ;
Marathe, Shashidhara ;
Karagadde, Shyamprasad ;
Lee, Peter D. .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2022, 299
[2]   Kinetic analysis of pore formation in die-cast metals and influence of absolute pressure on porosity [J].
Cao, Hanxue ;
Wang, Chengcheng ;
Shan, Qianyuan ;
Che, Junqi ;
Luo, Ziwei ;
Wang, Luhan ;
Huang, Mengtao .
VACUUM, 2019, 168
[3]   Grain refinement of hypoeutectic Al-Si alloys with B [J].
Chen, Zongning ;
Kang, Huijun ;
Fan, Guohua ;
Li, Jiehua ;
Lu, Yiping ;
Jie, Jinchuan ;
Zhang, Yubo ;
Li, Tingju ;
Jian, Xigao ;
Wang, Tongmin .
ACTA MATERIALIA, 2016, 120 :168-178
[4]   Effect of super vacuum assisted high pressure die casting on the repeatability of mechanical properties of Al-Si-Mg-Mn die-cast alloys [J].
Dong, Xixi ;
Zhu, Xiangzhen ;
Ji, Shouxun .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2019, 266 :105-113
[5]   Understanding the Initial Solidification Behavior for Al-Si Alloy in Cold Chamber High-Pressure Die Casting (CC-HPDC) Process Combining Experimental and Modeling Approach [J].
Dou, Kun ;
Zhang, Yijie ;
Lordan, Ewan ;
Jacot, Alain ;
Fan, Zhongyun .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2022, 53 (08) :3110-3124
[6]   A novel approach to optimize mechanical properties for aluminium alloy in High pressure die casting (HPDC) process combining experiment and modelling [J].
Dou, Kun ;
Lordan, Ewan ;
Zhang, Yijie ;
Jacot, Alain ;
Fan, Zhongyun .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2021, 296
[7]   Grain refining mechanism in the Al/Al-Ti-B system [J].
Fan, Z. ;
Wang, Y. ;
Zhang, Y. ;
Qin, T. ;
Zhou, X. R. ;
Thompson, G. E. ;
Pennycook, T. ;
Hashimoto, T. .
ACTA MATERIALIA, 2015, 84 :292-304
[8]   Dilatant shear bands in solidifying metals [J].
Gourlay, C. M. ;
Dahle, A. K. .
NATURE, 2007, 445 (7123) :70-73
[9]   Segregation band formation in Al-Si die castings [J].
Gourlay, CM ;
Laukli, HI ;
Dahle, AK .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2004, 35A (09) :2881-2891
[10]   Improvements engineered in UTS and elongation of aluminum alloy high pressure die castings through the alteration of runner geometry and plunger velocity [J].
Gunasegaram, D. R. ;
Givord, M. ;
O'Donnell, R. G. ;
Finnin, B. R. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2013, 559 :276-286
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