Room temperature deformation and mechanisms of slip transmission in oriented single-colony crystals of an α/β titanium alloy
TL;DR: In this paper, a Burgers orientation relationship between the α and the β phases has been assumed to allow for easy slip transmission across the α/β interfaces, and a simple model is presented based on the accumulation of residual dislocations at both the α /β interface and the α matrix, which provides insight into the mechanism of slip transmission, strain hardening and primary creep of these colony structures.
About: This article is published in Acta Materialia.The article was published on 1999-02-05. It has received 287 citations till now. The article focuses on the topics: Slip (materials science) & Creep.
Citations
More filters
TL;DR: In this paper, the macrostructure, microstructure and mechanical properties of a Ti-6Al-4V alloy after WAAM deposition have been investigated, and the average yield and ultimate tensile strengths of the as-deposited material were found to be slightly lower than those for a forged Ti- 6Al 4V bar (MIL-T 9047), however, the ductility was similar and the mean fatigue life was significantly higher.
Abstract: Wire and arc additive manufacturing (WAAM) is a novel manufacturing technique in which large metal components can be fabricated layer by layer. In this study, the macrostructure, microstructure, and mechanical properties of a Ti-6Al-4V alloy after WAAM deposition have been investigated. The macrostructure of the arc-deposited Ti-6Al-4V was characterized by epitaxial growth of large columnar prior-β grains up through the deposited layers, while the microstructure consisted of fine Widmanstatten α in the upper deposited layers and a banded coarsened Widmanstatten lamella α in the lower layers. This structure developed due to the repeated rapid heating and cooling thermal cycling that occurs during the WAAM process. The average yield and ultimate tensile strengths of the as-deposited material were found to be slightly lower than those for a forged Ti-6Al-4V bar (MIL-T 9047); however, the ductility was similar and, importantly, the mean fatigue life was significantly higher. A small number of WAAM specimens exhibited early fatigue failure, which can be attributed to the rare occurrence of gas pores formed during deposition.
512 citations
TL;DR: In this paper, the authors review the present understanding of defect-interface interactions in single-phase and two-phase metal and oxide nanocomposites, emphasizing how interface structure affects interactions with point, line, and planar defects.
427 citations
Cites background from "Room temperature deformation and me..."
...Thus, the interface incurs a smaller increase in its energy, which can favor the transmission event [201, 202]....
[...]
...The interface plane trace has a normal along (020) and is parallel to [202]....
[...]
TL;DR: In this paper, a method based on electron back-scattering diffraction (EBSD) measurements was used to identify activated slip systems, which allowed a statistical analysis of the nature (basal, prismatic, pyramidal) and distribution of the slip systems according to the crystallographic texture.
353 citations
TL;DR: In this paper, the spheroidization behavior of an α colony microstructure in Ti-6Al-4V alloy during warm working and subsequent annealing at 600 and 800°C was established.
319 citations
TL;DR: A review of the state-of-the-art of the understanding of cavity formation during stages I and II (primary and secondary) creep in polycrystalline metals and alloys, particularly at elevated temperatures, can be found in this article.
312 citations
References
More filters
TL;DR: In this paper, a survey of the literature on orientation relationships in precipitation systems is presented, based on a unified view of all the known relationships in b.c.c/h.p.
465 citations
TL;DR: In this paper, the atomic structure of the interphase boundary enclosing an α (hcp) precipitate formed from the β (bcc) matrix in a Ti-Cr alloy was examined.
Abstract: The atomic structure of the interphase boundary enclosing an α (hcp) precipitate formed from the β (bcc) matrix in a Ti-Cr alloy was examined. All the interfaces of an α lath exhibit continuity of atomic planes between the matrix and the precipitate and thus are considered to be coherent or semicoherent. Such observations imply that there is an atomic site correspondence during transformation. The shear component of the transformation strains arising from the passage of (a/12) [111]β transformation dislocations (structural ledges) on (112)β∥[1100)α planes is accommodated by a set of glissile dislocation loops existing on every sixth (1100)α plane at the side facet and the edge of an α lath. The volumetric component of the transformation strain is accommodated by a set of sessile misfit dislocations (b = (a/2)[110]β = (c/2) [0001]α J on the risers of the growth ledges at the side facet. The presence of sessile dislocations implies that the migration of α-β interfaces is a non-conservative process ...
85 citations
TL;DR: A wide variety of results have emerged on this transformation (since the interface phase was first observed over a decade ago) and at attempt is made to provide a consistent view-point for its formation as mentioned in this paper.
77 citations
68 citations