In-situ titanium alloy matrix composites were fabricated by melting-casting method and the effect of B content on microstructure and abrasive property of TiC/Ti6Al4V composites was studied.The results show that the average grain size of dendritic TiC in the composites is remarkably refined when the addition content of B is less than 0.06%(mass fraction).TiC dendrite gradually changes into small dendrite or even granular from coarse dendrite,but the abrasive property is obviously reduces with the increasing of B content.When B content further increases form 0.1% to 0.6%,the dendritic TiC can not be refined obviously,the fibre-shape TiB appears and the abrasive property of composites is improved.The refinement mechanism of boron is attributed to the combined effects of the increasing in nucleation rate at the constitutional supercooling zone ahead of the solidification front and the reduction in growth rate.The improvement of its abrasive property is attributed to the present of fibre-shape TiB during the abrasiving.
Key words
B addition /
TiC/Ti6Al4V composite /
microstructure /
abrasive property
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 宁聪琴,周玉.医用钛合金的发展及研究现状[J].材料科学与工艺,2002,10(1):100-106.
[2] 詹文革.生物医用钛及钛合金的研制、生产和应用[J].钛工业进展,2007,24(1):4-8.
[3] 于思荣.生物医学钛合金的研究现状及发展趋势[J].材料科学与工程,2000,18(2):131-134.
[4] SCHUH A,BIGONEY J,HNLE W,et al.Second generation(low modulus) titanium alloys in total hip arthroplasty[J].Materialwissenschaft und Werkstofftechnik,2007,38(12):1003-1007.
[5] TAMIRISAKANDALA S,BHAT R B,TILEY J S.Grain refinement of cast titanium alloys via trace boron addition[J].Scripta Materialia,2005,(53):1421-1426.
[6] LU Wei-jie,ZHANG Xiao-nong,ZHANG Di,et al.Microstructure and mechanical properties of in situ synthesized(TiB+TiC)/Ti matrix composites[J].The Chinese Journal of Nonferrous Metals,2000,10(2):163-169.
[7] TJONG S C,MA Z Y.Microstructural and mechanical characteristics of in situ metal matrix composites[J].Mater Sci Eng,2000,29:49.
[8] 吕维洁,张小农,张荻,等.铸态(TiB+TiC)/Ti复合材料组织和性能的研究[J].复合材料学报,2001,18(3):60-66.
[9] 葛志明.钛的二元系相图[M].北京:国防工业出版社,1977.
[10] JACKSON K A,HUNT J D.Lamellar and rod eutectic growth[J].Trans Met Soc AIME,1966,(236):1129-1142.
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}
PDF(670 KB)
