Three Regions of Dislocation Creep in &lt;I&gt;In Situ&lt;/I&gt; TiB Fiber-Reinforced &amp;alpha;-Titanium Matrix Composite

Kawabata, Kenshi; Satô, Eiichi; Kuribayashi, Kazuhiko

doi:10.2320/matertrans.43.1647

Cited by 3 publications

(3 citation statements)

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“…Experimental observations of plastically-accommodated creep have been presented in separate papers using special model materials, in situ TiB whisker-reinforced -Ti matrix composites [31][32][33] and spherical Al 2 O 3 particle-reinforced AlMg matrix composite through ingot metallurgy. 34) …”

Section: Other Remarksmentioning

confidence: 99%

Rationalization of Plastically-Accommodated Steady-State Creep of a Composite

et al. 2004

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Composite creep deformation was analyzed, based on a continuum plasticity representation of the matrix, in an ideal composite at high temperatures in the case of negligible interfacial diffusion and sliding. A general formula of the steady-state creep strain rate was derived for a composite consisting of an ellipsoidal rigid reinforcement and a creeping matrix with a stress exponent of one. A closed-form solution was then derived for a composite with a cylindrical reinforcement under pure shear deformation in a two-dimensional analysis. The resultant creep deformation satisfies the requirements of impotency, volume conservation and interfacial continuity. Traces of two types of edge dislocations were analytically drawn; they show that dislocations climb over the reinforcement, retaining no dislocations either in the matrix or at the interface. Also, two types of dislocations simultaneously climb up and down at any portion in the matrix through dislocation core shuffling without long-distance diffusion. Finally, it was concluded that plastically-accommodated creep is characterized by two types of dislocations that simultaneously climb over a reinforcement, generating a heterogeneous creep strain increment without long-distance diffusion.

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Section: Other Remarksmentioning

confidence: 99%

Rationalization of Plastically-Accommodated Steady-State Creep of a Composite

et al. 2004

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“…The details of them have been discussed in our previous paper. 25) Figure 4 shows the schematic in a doublelogarithmic scale.…”

Section: Individual Creep Mechanismsmentioning

confidence: 99%

“…23,24) The relationship between load transfer and diffusional flow in the steady-state creep can be interpreted by considering the accommodation processes of the misfit strain between the reinforcements and the matrix during creep. 25) At high temperatures, two kinds of accommodation processes can be considered: diffusional accommodation 19,20) by the diffusion flow along the interface, and plastic accommodation [1][2][3][4][5][6][7] by the heterogeneous flow of the matrix, corresponding to the load transfer concept. When the creep behavior of the composites is controlled by the accommodation processes, a strengthening effect produced by the reinforcement appears.…”

Section: Introductionmentioning

confidence: 99%

Volume Fraction Dependence of Plastic and Diffusional Accommodation in High-Temperature Deformation of Ti/TiB <I>In Situ</I> Composite: Appearance and Vanishing of Load Transfer Effect

2002

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The appearance and vanishing of the load transfer effect in the steady-state condition of composites' creep were analyzed via consideration of two accommodation processes, diffusion and plastic, which are inevitable for composites to continue creep deformation. Creep experiments were performed using model materials, Ti-5, 15 and 20 vol%TiB in situ composites, which have moderate diffusional-accommodationcontrolled creeps, good interfacial bonding and no fine dispersions. With higher strain rates than the diffusional-accommodation-controlled creep, the stress exponent of all composites was 4.5, similar to that of α-Ti, 4.3, and the strain rates decreased with increasing volume fraction of the reinforcements. Variations of the strain rate agreed with the prediction by the self-consistent potential method, and thus the load transfer effect was confirmed in this region. With strain rates near the diffusional-accommodation-controlled creep, the stress exponents of Ti-15 and 20 vol%TiB decreased to 2. With a strain rate lower than the diffusional-accommodation-controlled creep, the strain rates of the composites did not decrease with increasing volume fraction, and vanishing of the load transfer effect was observed.

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