Abstract
Superplastic forming and diffusion bonding (SPF/DB) has been recognized as a viable manufacturing technology. However, the basic understanding of grain size and its effects on the quality of diffusion bonds is still limited. In this study, a certain type of SP700 alloy with different grain sizes is bonded at superplastic temperature. The experimental results indicate that the same materials, if coarse-grained, may not readily bond under identical conditions of pressure, temperature, and time. This type of bonding is possible because of the presence of many grain boundaries in fine-grained materials that act as short-circuit paths for diffusion. In addition, grain-boundary migration is also faster in fine-grained than in coarse-grained materials. Fractographic studies show that the dimples on the coarse-grained specimen have large dimensions compared with that in the fine-grained material, indicating that heterogeneous deformation develops in the coarse-grained specimen during tension.
Highlights
Titanium and its alloys have been widely used in the medical, automotive, and aerospace industries due to their excellent mechanical properties [1,2,3,4]
The purpose of this paper is to explore the variation of grain size on the mechanical behaviors and bonding mechanism of SP700 alloy
This research aimed to investigate the effect of grain size on the diffusion bonding performance for the SP700 alloy
Summary
Titanium and its alloys have been widely used in the medical, automotive, and aerospace industries due to their excellent mechanical properties [1,2,3,4]. Perplastic forming and diffusion bonding have been recognized as a viable technology that enables both cost and weight saving compared with conventional methods. Plasticity refers to the ability of certain alloys to undergo extensive tensile strain at a specific temperature and strain rate [5,6,7]. The microstructure evolutions during the DB would certainly determine the mechanical behaviors of the formed parts [19]; the purpose of this study was to explore the effect of initial materials on the bonding joints microstructures
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