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Bonding of compound casted Ti/Al bimetal by heat treatment

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  • Received: 20 December 2019Revised: 22 May 2020Accepted: 25 May 2020Available online: 27 May 2020
  • The mechanism of the formation of bonding between compound cast Al/Ti bimetal during a heat treatment regime is investigated by casting commercially pure Al melt on a Ti bar in a steel tube and heat treating the compound cast Ti/Al bimetal for different periods of time, after the Al melt was solidified. No bonding was observed between the two metals after the initial casting. This was attributed to the presence of oxide films on the liquid Al and solid Ti alloys and the trapped atmosphere between them. The effect of these layers in preventing the formation of bonding was eliminated after heat treating the cast part at 973 K (700 oC) for at least 15 min and the metals started to bond with each other. A detailed mechanism for this bonding is presented in this paper.
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Bonding of compound casted Ti/Al bimetal by heat treatment

  • Corresponding author:

    Ramin Raiszadeh    E-mail: rraiszadeh@uk.ac.ir; rraiszadeh@yahoo.com

  • Dept. of Metallurgy and Materials Science, School of Engineering, Shahid Bahonar University of Kerman, Kerman, 7616913439, Iran

Abstract: The mechanism of the formation of bonding between compound cast Al/Ti bimetal during a heat treatment regime is investigated by casting commercially pure Al melt on a Ti bar in a steel tube and heat treating the compound cast Ti/Al bimetal for different periods of time, after the Al melt was solidified. No bonding was observed between the two metals after the initial casting. This was attributed to the presence of oxide films on the liquid Al and solid Ti alloys and the trapped atmosphere between them. The effect of these layers in preventing the formation of bonding was eliminated after heat treating the cast part at 973 K (700 oC) for at least 15 min and the metals started to bond with each other. A detailed mechanism for this bonding is presented in this paper.

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