Ti sub(5)Si sub(3)/ beta -Ti nano-core-shell structure toughened glassy Ti alloy matrix biocomposites

• Published in: RSC advances 2015-01, Vol.5 (11), p.8355-8361
• Main Authors: Cui, Chunxiang, Bai, Ling, Liu, Shuangjin, Qi, Yumin, Zhao, Lichen
• Format: Article
• Language: English
• Subjects: Alloys; Glassy; Heating; Melt spinning; Nanostructure; Ribbons; Tensile tests; Titanium; Titanium base alloys
• ISSN: 2046-2069
• DOI: 10.1039/c4ra10738a

In the experiment, Ti sub(75)Zr sub(11)Si sub( 9)Fe sub(5) and Ti sub(66)Zr sub(11)Si sub( 15)Fe sub(5)Mo sub(3) ingots were prepared by vacuum arc-melting furnace. Both Ti alloy ribbons of 3-5 mm in width and about 80 mu m in thickness were made from bulk samples by an as-quenched technique under an argon atmosphere. Both melt-spun glassy ribbons exhibit large supercooled liquid regions, high reduced glass transition temperatures, and good thermal stabilities. For both alloys, the stable phases after heating are a Ti glassy matrix and in situnano-Ti sub(5)Si sub(3) particles encircled by nano shell of beta -Ti. After the Ti sub(5)Si sub(3)/ beta -Ti nano-core-shell structure was in situformed, in situTi sub(5)Si sub(3)/ beta -Ti nano-core-shell structure toughened glassy Ti alloy matrix composites were prepared. For the Ti sub(66)Zr sub(11)Si sub( 15)Fe sub(5)Mo sub(3) ribbons, its high strength is attributed to both Mo solution strengthening and nano core-shell Ti sub(5)Si sub(3)/ beta -Ti toughening and dispersion strengthening. Observations and analysis on microstructure and fracture morphology of melt-spun glassy ribbons indicated that multi-slip bands were formed during the tensile test.