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Acta Metall Sin  2016, Vol. 52 Issue (2): 135-142    DOI: 10.11900/0412.1961.2015.00216
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DEFORMATION BEHAVIOR AND THE MECHANISM OF MICRO-SCALE Ti-10V-2Fe-3Al PILLARSIN COMPRESSION
Rui YANG,Yan PAN,Wei CHEN,Qiaoyan SUN(),Lin XIAO,Jun SUN
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
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Abstract  

Ti and its alloys have potential application in micro-electromechanical systems (MEMS) for its excellent mechanical properties. The strength of micro- and nano-scale Ti and its alloys has been proven significantly increased as the sample size decreased, which is known as the "size effect", when dislocation and twinning are dominant plastic deformation modes. Martensitic transformation is an important plastic deformation mode in the Ti alloys. However, there is a limited research on the martensitic transformation in small-scale. Therefore, the study on mechanical behavior and deformation mechanism of [011]-oriented Ti-10V-2Fe-3Al (Ti1023) single crystal micropillars in a size range of 0.3~2.0 μm were investigated under uniaxial compression. The results show that Ti1023 micropillars exhibit smooth stress-strain curves in the regime of plastic deformation without a conventional strain burst phenomenon in the submicron pillars. It means continuous plastic strain hardening. The relationship between the yield stress (σ0.2), the stress for stress-induced martensite phase (SIM) transformation (σcm) and the sample size can be expressed in the forms of σ0.2d -0.18 and σcmd -0.28 , respectively. Strain hardening exponent (n) in creases with decreasing micropillar size. SEM examination together with crystallography analysis show that {112}<111> slip predominates plastic deformation mode in the Ti1023 micropillars. Transmission electron microscopy (TEM) observation of microstructures in the deformed and undeformed micropillars indicate that both nanoscale athermal ω particles and SIM phase α″ impede dislocation movement, and prohibit the formation of tangled dislocations in a collective, avalanche-like way resulting in strain bursts.

Key words:  Ti-10V-2Fe-3Al      stress induced martensite (SIM)      size effect      strain hardening     
Received:  13 April 2015     
Fund: Supported by National Natural Science Foundation of China (Nos.51271136, 51321003 and 51301127), National Basic Research Program of China (No.2014CB644003) and Program of Introducing Talents of Discipline to Universities of China (NoB06025)

Cite this article: 

Rui YANG,Yan PAN,Wei CHEN,Qiaoyan SUN,Lin XIAO,Jun SUN. DEFORMATION BEHAVIOR AND THE MECHANISM OF MICRO-SCALE Ti-10V-2Fe-3Al PILLARSIN COMPRESSION. Acta Metall Sin, 2016, 52(2): 135-142.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00216     OR     https://www.ams.org.cn/EN/Y2016/V52/I2/135

Fig.1  Grain orientation image map (OIM) of polycrystalline Ti1023 sample (The large grain indicated by arrow showes the [011] orientation for micropillars fabrication)
Fig.2  Engineering stress-engineering strain (a) and true stress-true strain (b) curves of Ti1023 micropillars in a range of size of 0.3~2.0 μm
  Fig.3 lgσt-lgεt curves for [011] Ti1023 micropillars after yielding (a) and strain hardening exponent (n) as a function of size of micropillar top (d) (b) (σt—true stress, εt—true strain)
Fig.4  Relationship curves of σ0.2 and σcm vs d (σ0.2—yield stress, σcm—stress for stress-induced martensitic transformation)
Fig.5  SEM images of pillars before and after compression (A and B are the front and left side faces, while A′ and B′ are corresponded to opposite faces of A and B, respectively)
Fig.6  TEM images of micropillars with 2.0 μm before compression
Fig.7  TEM images of a micropillar (1.0 μm) after compression to 20% engineering strain
Table 1  Angles (θ) between normal of slip planes and [011] loading axis in bcc metals
Fig.8  Schematics of slip system {110}<111>, {112}<111>, {123}<111> of bcc metals (a) and {112} slip plane in Ti1023 micropillars compressed along [011] (b)
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