Surface hardening of aluminum alloy by shot peening treatment with Zn based ball

Kyun Taek Cho; Kyung Song; Sang Ho Oh; Young Kook Lee; Kyoung Mook Lim; Won Beom Lee

doi:10.1016/j.msea.2012.02.043

Surface hardening of aluminum alloy by shot peening treatment with Zn based ball

Kyun Taek Cho, Kyung Song, Sang Ho Oh, Young Kook Lee, Kyoung Mook Lim, Won Beom Lee

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

A study was carried out to investigate the surface hardening of aluminum alloy 2024, when it was shot peened with soft Zn-based shot ball. Shot peening process was carried out at 0.3. MPa with the variable process times, using the compressed air. After shot peening treatment, the surface hardness of AA 2024 increased up to about 140. HV from 65. HV of the base material. Shot peening treatment caused the severe plastic deformation onto surface region and Zn based phase was alloyed during the surface treatment, which was originated from Zn based shot ball. A lamellar structure in the stacking order of Al and Zn based phase was formed ranging from the treated surface to the depth of several hundreds of nanometers. The Al and Zn based phase presented nanocrystallized microstructure, showing the average grain size of about 87. nm and 13. nm, respectively. The structural characteristic of the lamellar structure and nanocrystalline grain for two phases could be main factors for the surface hardening of AA 2024. Besides, small precipitations that remained undissolved and kept its original shape in spite of severe plastic deformation could be considered to be a secondary factor for the surface hardening.

Original language	English
Pages (from-to)	44-49
Number of pages	6
Journal	Materials Science and Engineering A
Volume	543
DOIs	https://doi.org/10.1016/j.msea.2012.02.043
Publication status	Published - 2012 May 1

Bibliographical note

Funding Information:
This work was supported by a grant of Ministry of Knowledge Economy , Korea.

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2012.02.043

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title = "Surface hardening of aluminum alloy by shot peening treatment with Zn based ball",

abstract = "A study was carried out to investigate the surface hardening of aluminum alloy 2024, when it was shot peened with soft Zn-based shot ball. Shot peening process was carried out at 0.3. MPa with the variable process times, using the compressed air. After shot peening treatment, the surface hardness of AA 2024 increased up to about 140. HV from 65. HV of the base material. Shot peening treatment caused the severe plastic deformation onto surface region and Zn based phase was alloyed during the surface treatment, which was originated from Zn based shot ball. A lamellar structure in the stacking order of Al and Zn based phase was formed ranging from the treated surface to the depth of several hundreds of nanometers. The Al and Zn based phase presented nanocrystallized microstructure, showing the average grain size of about 87. nm and 13. nm, respectively. The structural characteristic of the lamellar structure and nanocrystalline grain for two phases could be main factors for the surface hardening of AA 2024. Besides, small precipitations that remained undissolved and kept its original shape in spite of severe plastic deformation could be considered to be a secondary factor for the surface hardening.",

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AU - Oh, Sang Ho

AU - Lee, Young Kook

AU - Lim, Kyoung Mook

AU - Lee, Won Beom

N1 - Funding Information: This work was supported by a grant of Ministry of Knowledge Economy , Korea.

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Y1 - 2012/5/1

N2 - A study was carried out to investigate the surface hardening of aluminum alloy 2024, when it was shot peened with soft Zn-based shot ball. Shot peening process was carried out at 0.3. MPa with the variable process times, using the compressed air. After shot peening treatment, the surface hardness of AA 2024 increased up to about 140. HV from 65. HV of the base material. Shot peening treatment caused the severe plastic deformation onto surface region and Zn based phase was alloyed during the surface treatment, which was originated from Zn based shot ball. A lamellar structure in the stacking order of Al and Zn based phase was formed ranging from the treated surface to the depth of several hundreds of nanometers. The Al and Zn based phase presented nanocrystallized microstructure, showing the average grain size of about 87. nm and 13. nm, respectively. The structural characteristic of the lamellar structure and nanocrystalline grain for two phases could be main factors for the surface hardening of AA 2024. Besides, small precipitations that remained undissolved and kept its original shape in spite of severe plastic deformation could be considered to be a secondary factor for the surface hardening.

AB - A study was carried out to investigate the surface hardening of aluminum alloy 2024, when it was shot peened with soft Zn-based shot ball. Shot peening process was carried out at 0.3. MPa with the variable process times, using the compressed air. After shot peening treatment, the surface hardness of AA 2024 increased up to about 140. HV from 65. HV of the base material. Shot peening treatment caused the severe plastic deformation onto surface region and Zn based phase was alloyed during the surface treatment, which was originated from Zn based shot ball. A lamellar structure in the stacking order of Al and Zn based phase was formed ranging from the treated surface to the depth of several hundreds of nanometers. The Al and Zn based phase presented nanocrystallized microstructure, showing the average grain size of about 87. nm and 13. nm, respectively. The structural characteristic of the lamellar structure and nanocrystalline grain for two phases could be main factors for the surface hardening of AA 2024. Besides, small precipitations that remained undissolved and kept its original shape in spite of severe plastic deformation could be considered to be a secondary factor for the surface hardening.

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Surface hardening of aluminum alloy by shot peening treatment with Zn based ball

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