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An investigation on diffusion bonding of aluminum to copper using equal channel angular extrusion process.

Eslami P, Taheri AK - Mater Lett (2011)

Bottom Line: A new method for production of bimetallic rods, utilizing the equal channel angular extrusion (ECAE) process has been introduced before by previous researchers, but no attempt has been made to assess the effect of different temperatures and holding times in order to achieve a diffusional bond between the mating surfaces.In present research copper sheathed aluminum rods have been ECAEed at room temperature and subsequently held at a constant ECAE pressure, at different temperatures and holding times to produce a diffusional bond between the copper sheath and the aluminum core.Based on the results, a bonding temperature of 200 °C and holding time of 60-80 min yielded the highest shear strength value.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave., P.O. Box 11365-9466, Tehran, Iran.

ABSTRACT
A new method for production of bimetallic rods, utilizing the equal channel angular extrusion (ECAE) process has been introduced before by previous researchers, but no attempt has been made to assess the effect of different temperatures and holding times in order to achieve a diffusional bond between the mating surfaces. In present research copper sheathed aluminum rods have been ECAEed at room temperature and subsequently held at a constant ECAE pressure, at different temperatures and holding times to produce a diffusional bond between the copper sheath and the aluminum core. The bonding quality of the joints was examined by shear strength test and a sound bonding interface was achieved. Based on the results, a bonding temperature of 200 °C and holding time of 60-80 min yielded the highest shear strength value.

No MeSH data available.


Related in: MedlinePlus

Dependence of the joint shear strength on holding time at a constant bonding temperature.
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f0010: Dependence of the joint shear strength on holding time at a constant bonding temperature.

Mentions: As can be seen from Fig. 2, at a constant bonding temperature, the joint average shear strength increases with increasing the holding time and this is due to the increase in the extent of joint formed and the fact that prolonging the holding time would let the diffusion mechanisms to complete and leads to a better void closure [15]. However, after a specific time which depends on the bonding temperature (60 min for bonding temperatures of 200 °C and 225 °C), degradation of this increasing trend is observed to the extent that after a short time the shear strength values remain constant with increasing the holding time. It is well known that the condition of a surface which is to be joined by solid-state diffusion bonding plays a vital role in determining the minimum bonding time required and the integrity of the final bond [16]. It is obvious that the bonding time can be shortened greatly by improving the surface finish quality. The presence of large asperities on the bonding area prevents extensive plastic deformation of the surface asperities due to poor contact area. Accordingly, the bonding time will increase [17].


An investigation on diffusion bonding of aluminum to copper using equal channel angular extrusion process.

Eslami P, Taheri AK - Mater Lett (2011)

Dependence of the joint shear strength on holding time at a constant bonding temperature.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3102181&req=5

f0010: Dependence of the joint shear strength on holding time at a constant bonding temperature.
Mentions: As can be seen from Fig. 2, at a constant bonding temperature, the joint average shear strength increases with increasing the holding time and this is due to the increase in the extent of joint formed and the fact that prolonging the holding time would let the diffusion mechanisms to complete and leads to a better void closure [15]. However, after a specific time which depends on the bonding temperature (60 min for bonding temperatures of 200 °C and 225 °C), degradation of this increasing trend is observed to the extent that after a short time the shear strength values remain constant with increasing the holding time. It is well known that the condition of a surface which is to be joined by solid-state diffusion bonding plays a vital role in determining the minimum bonding time required and the integrity of the final bond [16]. It is obvious that the bonding time can be shortened greatly by improving the surface finish quality. The presence of large asperities on the bonding area prevents extensive plastic deformation of the surface asperities due to poor contact area. Accordingly, the bonding time will increase [17].

Bottom Line: A new method for production of bimetallic rods, utilizing the equal channel angular extrusion (ECAE) process has been introduced before by previous researchers, but no attempt has been made to assess the effect of different temperatures and holding times in order to achieve a diffusional bond between the mating surfaces.In present research copper sheathed aluminum rods have been ECAEed at room temperature and subsequently held at a constant ECAE pressure, at different temperatures and holding times to produce a diffusional bond between the copper sheath and the aluminum core.Based on the results, a bonding temperature of 200 °C and holding time of 60-80 min yielded the highest shear strength value.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave., P.O. Box 11365-9466, Tehran, Iran.

ABSTRACT
A new method for production of bimetallic rods, utilizing the equal channel angular extrusion (ECAE) process has been introduced before by previous researchers, but no attempt has been made to assess the effect of different temperatures and holding times in order to achieve a diffusional bond between the mating surfaces. In present research copper sheathed aluminum rods have been ECAEed at room temperature and subsequently held at a constant ECAE pressure, at different temperatures and holding times to produce a diffusional bond between the copper sheath and the aluminum core. The bonding quality of the joints was examined by shear strength test and a sound bonding interface was achieved. Based on the results, a bonding temperature of 200 °C and holding time of 60-80 min yielded the highest shear strength value.

No MeSH data available.


Related in: MedlinePlus