Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Determination of Mechanical Properties of Equal Channel Angular Pressed Aluminum Alloys in Nano-surface Region

나노표면 영역에서의 ECAP 변형된 알루미늄합금의 기계적 물성변화 측정

  • 안성빈 (조선대학교 첨단소재공학과) ;
  • 김정석 (조선대학교 재료공학과)
  • Received : 2019.05.08
  • Accepted : 2019.05.20
  • Published : 2019.05.30
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Abstract

The effects of severe plastic deformation and heat treatment on the mechanical properties of Al 5052 and 6005 alloys were investigated using the metallurgical technique and nano-indentation technique in nano-surface region. Equal channel angular pressing (ECAP) was used to apply severe plastic deformation to the aluminum alloys in order to obtain fine grain sized materials. The elastic modulus was measured and interpreted in relation to the metallurgical observation. The elastic modulus increased after ECAP process due to evolution of the fine grains. However, the elastic modulus decreased after heat treatment due to generation of coarsened precipitates on the grain boundaries.

Keywords

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Fig. 1. Block diagram of TriboScope for nanomechanical test system.

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Fig. 2. Microstructure of the solution treated and ECAPed aluminum 5052 alloy.

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Fig. 3. Microstructure of the ECAPed aluminum 6005 alloy.

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Fig. 4. (a) Indentation load-displacement curves for solution and ECAPed Al 5052 alloy. (b) Typical AFM topograph of ECAPed Al 5052 corresponding to the indentation curve shown in (a).

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Fig. 5. Reduced elastic modulus of aluminum 5052 and 6005 alloy; (a) Al 5052 alloy and (b) Al 6005 alloy.

Table 1. Chemical composition of aluminum alloys (wt.%)

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