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

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Transactions of Nonferrous Metals Society of China

Vol. 25    No. 3    March 2015

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Deformation and fracture behavior of commercially pure titanium with gradient nano-to-micron-grained surface layer
Yan-fei YIN1,2, Wei XU1, Qiao-yan SUN1, Lin XIAO1, Jun SUN1

1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;
2. Northwest Institute for Nonferrous Metals Research, Xi’an 710016, China

Abstract:Titanium with gradient nano-to-micron scale grains from surface to matrix was fabricated by surface mechanical grinding treatment (SMGT) at room temperature. The SMGT-treated titanium shows higher strength than that of as-received one, but moderate ductility between those of ultra-fine grained (UFG) and coarse-grained titanium. Tensile stress-strain curves of SMGT-treated titanium show double strain hardening regimes. The strain hardening rate (dσ/dε) decreases with increasing strain in tensile deformation. The high strain hardening rate at initial yielding is attributed to nano-to-micron-grained surface layer. The low strain hardening rate at large plastic strain regime primarily results from coarse-grained matrix. The SMGT-treated titanium shows a ductile fracture mode with a large number of dimples. The small size of dimples in the treated surface layer is due to the combination of the high strength and strain hardening exponent. The difference between dimple size in nano-to-micron-grained surface layer and coarse-grained matrix is discussed in terms of plastic zone size at the tip of crack in the SMGT-treated titanium.


Key words: surface mechanical grinding treatment; commercially pure titanium; gradient nano-to-micron grain; strain hardening; dimple

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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