Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 27    No. 12    December 2017

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Microstructure and mechanical properties of Al-TiB2/TiC in situ composites improved via hot rolling
Jin-feng NIE1, Fang WANG1,Yu-sheng LI1, Yan-fang LIU1, Xiang-fa LIU2, Yong-hao ZHAO1

1. Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; 2. Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Ji’nan 250061, China

Abstract:A kind of Al-TiB2/TiC in situ composite with a homogenous microstructure was successfully prepared through in situ reaction of pure Ti and Al-B-C alloy with molten aluminum. In order to improve the distribution of the particles and mechanical properties of the composites, subsequent hot rolling with increasing reduction was carried out. The microstructure evolution of the composites was characterized using field emission scanning electron microscopy (FESEM) and the mechanical properties were studied through tensile tests and microhardness measurement. It is found that both the microstructure uniformity and mechanical properties of the composites are significantly improved with increasing rolling reduction. The ultimate tensile strength and microhardness of the composites with 90% rolling reduction reach 185.9 MPa and HV 59.8, respectively, 140% and 35% higher than those of as-cast ones. Furthermore, the strengthening mechanism of the composite was analyzed based on the fracture morphologies.

 

Key words: in-situ composites; TiB2/TiC particles; rolling; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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