Principles of superplastic diffusion bonding

Maehara, Yasuhiro; Komizo, Yu-ichi; Langdon, Terence G.

doi:10.1179/mst.1988.4.8.669

Cited by 27 publications

(3 citation statements)

References 22 publications

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“…This feature is mainly dependent on the grain size; the fine grained materials are more suitable for superplasticity as the creep mechanism is readily achieved. This contributes to bonding formation [26]. Although, dynamic grain growth was reported during superplastic deformation of the super α 2 alloy at 980…”

Section: Pressurementioning

confidence: 99%

A metallographic investigation of the effect of bonding pressure and surface finish on isostatic diffusion bonding of Ti-25Al-10Nb-3Mo-1V

TALAS¹,

KHAN²

2016

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The performance of diffusion bonding is critically dependent on the surface finish and the bonding pressure holding the mating surfaces together for an appropriate time. Effects of surface finish and pressure on the bonding performance of Ti-25Al-10Nb-3V-1Mo super alpha two titanium aluminides were investigated at the temperature of 1000• C for 1 h holding time. Results showed that successful diffusion bonding was achieved using 800 Grit/15 MPa and 180 Grit/20 MPa surface finish and pressure combinations. It was also shown that the bonding pressure and surface finish combinations used in this study affected the microstructure and the physical appearance of bond line in all specimens.K e y w o r d s : diffusion bonding, titanium aluminides, surface finish

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Section: Pressurementioning

confidence: 99%

A metallographic investigation of the effect of bonding pressure and surface finish on isostatic diffusion bonding of Ti-25Al-10Nb-3Mo-1V

TALAS¹,

KHAN²

2016

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“…The diffusion bonding is that metals are bonded by way of partial plastic deformation of bonded surfaces under the high temperature and pressure. Then, mutual diffusion of atoms between metals forms metallic bond so that the metals are tightly bonded [1][2]. Superplasticity of materials can accelerate the process of solid-state diffusion bonding, reduce diffusion bonding temperature and achieve good bonding properties.…”

Section: Introductionmentioning

confidence: 99%

Study on the Interface Characteristic of Superplastic Diffusion Bonding Joint of Dissimilar Steels

Wang

Guo

2007

MSF

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Magnesium alloys show promise in meeting the demand for materials of lighter weight and higher rigidity. Mg alloys are hard to process and normally require grain refining for improved formability and mechanical properties. To process these fine-grained Mg alloys effectively, it is important to relate their load stress and mechanical properties to changes in their microstructures. Using a biaxial tensile machine and cruciform specimens, to evaluate the mechanical properties, microstructure, and plasticity, in a high temperature biaxial stress state, used of AZ31 Mg alloy sheet. With biaxial deformation, grain boundary slide occurred more frequently than with uniaxial deformation, causing grain boundary separation and formation of micro-voids between the grains. In the vicinity of the cracks and at the locations of grain boundary separation, although deformation temperature at higher than the recrystallization temperature, fine grains (about 2 μm) showing in duplex grain structures were formed locally. The formation of duplex grain structures as a result of local formation of fine grains during the deformation process is a major issue to be solved from the viewpoint of plasticity processing.

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“…To synthesize chemically clean planar interfaces by diffusion bonding, the substrate must be macroscopically and microscopically flat and chemically clean. 3 Macro-flatness, necessary for bonding to occur over large areas, was ensured by conventional mechanical polishing and lapping. Substrate surfaces were cleaned by a broad (3cm) 500 eV ion beam (Ar or Xe) at 15° incidence.…”

mentioning

confidence: 99%

Chemically Clean Planar Interface Synthesis: Substrate Surface and Interface Cross Section Microscopy

Xu¹,

Cox²,

Kim³

1997

Microsc Microanal

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An ultra high vacuum (UHV) planar interface unit has been constructed to study the effect of interface/boundary structure and chemistry on properties. We report here initial observations of substrate morphology and chemistry prior to bonding and resulting interface morphology obtained using austenitic stainless steel.To synthesize chemically clean planar interfaces by diffusion bonding, the substrate must be macroscopically and microscopically flat and chemically clean. Macro-flatness, necessary for bonding to occur over large areas, was ensured by conventional mechanical polishing and lapping. Substrate surfaces were cleaned by a broad (3cm) 500 eV ion beam (Ar or Xe) at 15° incidence. The resulting changes in substrate near-atomic-scale roughness and chemistry were analyzed using Auger spectroscopy (AES) and Atomic Force Microscopy (AFM). Before ion beam cleaning, the sub-strates exhibited high oxygen and carbon contamination (Fig la). Both Xe and Ar ion cleaning reduced these values; the result for 5 minutes Ar cleaning is shown in Fig lb.

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Principles of superplastic diffusion bonding

Cited by 27 publications

References 22 publications

A metallographic investigation of the effect of bonding pressure and surface finish on isostatic diffusion bonding of Ti-25Al-10Nb-3Mo-1V

A metallographic investigation of the effect of bonding pressure and surface finish on isostatic diffusion bonding of Ti-25Al-10Nb-3Mo-1V

Study on the Interface Characteristic of Superplastic Diffusion Bonding Joint of Dissimilar Steels

Chemically Clean Planar Interface Synthesis: Substrate Surface and Interface Cross Section Microscopy

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