Abstract
Closed-cell porous aluminum is expected to be used in automobile components, because porous aluminum has good lightweight properties and can realize the improvement of fuel efficiency. Recently, a new processing route for fabricating porous aluminum, in which friction stir processing (FSP) is used, has been developed. In the FSP route, a precursor is fabricated by mixing blowing agent powder and stabilization agent powder into aluminum alloy plates by the significant stirring action of FSP. In this contribution, ADC12 porous aluminum is fabricated by the FSP route using high recyclability ADC12 aluminum alloy die castings and the effect of the tool rotating rate and the number of passes on the porosity and morphology of the pores is investigated. It is shown that groove-like defect was formed because of abnormal stirring action at any tool rotating rate. However, by applying multi-pass FSP, the defect disappeared at 800 and 1000 rpm. On the other hand, the defect remained at 1200 and 1400 rpm instead of carrying out 4 pass FSP. The porosity and the morphology of pores of obtained porous aluminum were affected by these defects. It is shown that closed-cell porous aluminum with uniform pore size distribution and with porosity of about 50-60% is successfully fabricated using ADC12 aluminum alloy die castings at the tool rotating rate of 800-1000 rpm and a holding time of 10 minutes and a holding temperature of 933 K.
| Original language | English |
|---|---|
| Pages (from-to) | 647-651 |
| Number of pages | 5 |
| Journal | Keikinzoku/Journal of Japan Institute of Light Metals |
| Volume | 59 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2009 Nov |
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Keywords
- Aluminum
- Die casting
- Foam
- Friction stir processing
- Porosity
- Porous metals
ASJC Scopus subject areas
- Materials Chemistry
- Metals and Alloys
- Mechanical Engineering
- Mechanics of Materials
Cite this
Effects of tool rotating rate and pass number on pore structures of ADC12 porous aluminum fabricated by friction stir processing. / Hangai, Yoshihiko; Utsunomiya, Takao.
In: Keikinzoku/Journal of Japan Institute of Light Metals, Vol. 59, No. 11, 11.2009, p. 647-651.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of tool rotating rate and pass number on pore structures of ADC12 porous aluminum fabricated by friction stir processing
AU - Hangai, Yoshihiko
AU - Utsunomiya, Takao
PY - 2009/11
Y1 - 2009/11
N2 - Closed-cell porous aluminum is expected to be used in automobile components, because porous aluminum has good lightweight properties and can realize the improvement of fuel efficiency. Recently, a new processing route for fabricating porous aluminum, in which friction stir processing (FSP) is used, has been developed. In the FSP route, a precursor is fabricated by mixing blowing agent powder and stabilization agent powder into aluminum alloy plates by the significant stirring action of FSP. In this contribution, ADC12 porous aluminum is fabricated by the FSP route using high recyclability ADC12 aluminum alloy die castings and the effect of the tool rotating rate and the number of passes on the porosity and morphology of the pores is investigated. It is shown that groove-like defect was formed because of abnormal stirring action at any tool rotating rate. However, by applying multi-pass FSP, the defect disappeared at 800 and 1000 rpm. On the other hand, the defect remained at 1200 and 1400 rpm instead of carrying out 4 pass FSP. The porosity and the morphology of pores of obtained porous aluminum were affected by these defects. It is shown that closed-cell porous aluminum with uniform pore size distribution and with porosity of about 50-60% is successfully fabricated using ADC12 aluminum alloy die castings at the tool rotating rate of 800-1000 rpm and a holding time of 10 minutes and a holding temperature of 933 K.
AB - Closed-cell porous aluminum is expected to be used in automobile components, because porous aluminum has good lightweight properties and can realize the improvement of fuel efficiency. Recently, a new processing route for fabricating porous aluminum, in which friction stir processing (FSP) is used, has been developed. In the FSP route, a precursor is fabricated by mixing blowing agent powder and stabilization agent powder into aluminum alloy plates by the significant stirring action of FSP. In this contribution, ADC12 porous aluminum is fabricated by the FSP route using high recyclability ADC12 aluminum alloy die castings and the effect of the tool rotating rate and the number of passes on the porosity and morphology of the pores is investigated. It is shown that groove-like defect was formed because of abnormal stirring action at any tool rotating rate. However, by applying multi-pass FSP, the defect disappeared at 800 and 1000 rpm. On the other hand, the defect remained at 1200 and 1400 rpm instead of carrying out 4 pass FSP. The porosity and the morphology of pores of obtained porous aluminum were affected by these defects. It is shown that closed-cell porous aluminum with uniform pore size distribution and with porosity of about 50-60% is successfully fabricated using ADC12 aluminum alloy die castings at the tool rotating rate of 800-1000 rpm and a holding time of 10 minutes and a holding temperature of 933 K.
KW - Aluminum
KW - Die casting
KW - Foam
KW - Friction stir processing
KW - Porosity
KW - Porous metals
UR - http://www.scopus.com/inward/record.url?scp=74349089255&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=74349089255&partnerID=8YFLogxK
U2 - 10.2464/jilm.59.647
DO - 10.2464/jilm.59.647
M3 - Article
VL - 59
SP - 647
EP - 651
JO - Keikinzoku/Journal of Japan Institute of Light Metals
JF - Keikinzoku/Journal of Japan Institute of Light Metals
SN - 0451-5994
IS - 11
ER -