Tensile toughening of powder-injection-molded β Ti-Nb-Zr biomaterials by adjusting TiC particle distribution from aligned to dispersed pattern

Xu，Peng1; Pyczak，Florian2; Yan，Ming1,3; Limberg，Wolfgang1; Willumeit-Römer，Regine1; Ebel，Thomas1

2020-06-01

10.1016/j.apmt.2020.100630

Applied Materials Today   影响因子和分区

2352-9407

2352-9407

The powder metallurgically produced β titanium alloys have long been plagued by high impurity contamination. One of them is the carbon contamination of binder-based powder technologies that originates from the sintering atmosphere, the debinding process and the starting powders. In general, a normal carbon residual of binder-based powder technologies is capable of incurring the formation of aligned TiC particles along prior β grain boundaries (GB-TiC) in most classes of β titanium. Premature intergranular fracture of materials invariably ensues during plastic deformation, which hinders their commercialization in structural applications. A novel toughening strategy by regulating TiC precipitation evolution and resultantly adjusting particle distribution is suggested. In this study, biotolerant metastable β Ti-Nb-Zr alloys containing 0.05 wt% standard carbon residual and consequently 0.5 vol% in situ synthesized TiC particles were fabricated via powder injection molding. Synchrotron radiation identified that two separate TiC precipitation-type reactions occurred at β phase region and α/β region. In a narrow temperature range between these two precipitation reactions, dissolution of carbides is observed just below α/β transus. Yttrium addition can postpone TiC precipitation. On the basis of those mechanisms, adjusting TiC particle distribution is proposed for the first time, specifically a combination of yttrium addition (Y) and carbide spheroidization reprecipitation annealing (CSRA). As a result, aligned GB-TiC particles were adjusted to dispersed intragranular TiC particles. An apparent toughening effect (≈113% increment reaching ε = 8.3%) was achieved after TiC redistribution, while non-optimally aligned TiC pattern seriously limited tensile toughness of materials by two negative crack propagation modes. Here, the mechanisms of TiC redistribution behavior and its toughening are elucidated systematically.

Carbides Particle distribution Powder injection molding Tensile testing Titanium alloys Toughness

SCI ; EI

英语

其他

Natural Science Foundation of China[51971108] ; Research and Development Program Project in Key Areas of Guangdong Province[2019B090907001] ; Shenzhen Science and Technology Innovation Commission[JCYJ20170817110358927]

Materials Science

Materials Science, Multidisciplinary

WOS:000546200100005

ELSEVIER

20201508383249

Titanium alloys ; Injection molding ; Powder metallurgy ; Niobium alloys ; Carbon ; Titanium carbide ; Grain boundaries ; Sintering ; Zircaloy ; Synchrotron radiation ; Textures

Metallurgy and Metallography:531 ; Titanium and Alloys:542.3 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Particle Accelerators:932.1.1

2-s2.0-85082712652

Scopus

1.Division of Metallic Biomaterials,Institute of Materials Research,Geesthacht,Helmholtz-Zentrum Geesthacht,D-21502,Germany
2.Division of Materials Physics,Institute of Materials Research,Geesthacht,Helmholtz-Zentrum Geesthacht,D-21502,Germany
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Xu，Peng,Pyczak，Florian,Yan，Ming,et al. Tensile toughening of powder-injection-molded β Ti-Nb-Zr biomaterials by adjusting TiC particle distribution from aligned to dispersed pattern[J]. Applied Materials Today,2020,19.

Xu，Peng,Pyczak，Florian,Yan，Ming,Limberg，Wolfgang,Willumeit-Römer，Regine,&Ebel，Thomas.(2020).Tensile toughening of powder-injection-molded β Ti-Nb-Zr biomaterials by adjusting TiC particle distribution from aligned to dispersed pattern.Applied Materials Today,19.

Xu，Peng,et al."Tensile toughening of powder-injection-molded β Ti-Nb-Zr biomaterials by adjusting TiC particle distribution from aligned to dispersed pattern".Applied Materials Today 19(2020).