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Effects of β-precipitates on the low temperature toughness of Al-5%Mg and equi-axed 5083 alloys
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- OKAMOTO Shuji
- Central Research Laboratory, Kobe Steel Ltd.
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- ASANO Kazuhiko
- Central Research Laboratory, Kobe Steel Ltd.
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- FUJIWARA Akira
- Central Research Laboratory, Kobe Steel Ltd.
Bibliographic Information
- Other Title
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- Al‐5%Mgおよび5083等軸粒合金のじん性に及ぼすβ相の影響
- Al 5パーセント Mg オヨビ 5083トウジクリュウ ゴウキン ノ ジンセ
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Description
Low temperature toughness of Al-Mg alloys with equi-axed grains has been investigated by means of the tear test at RT to -196°C and effects of β-precipitates on modes of fracture were discussed. The unit propagation energy (UPE) and the tear strength at -196°C decreased markedly on aging above 150°C. This was successfully attributed to the intergranular fracture as a result of precipitation of fi phase on grain boundaries. UPE was expressed as a function of the fraction of the grain boundary fracture fGB, as<br>UPE=-4.6fGB + 4.2, kg-mm/mm2.<br>It has been shown that dimple patterns are formed on the grain boundary surface after sufficient aging. The dimples were formed on β-precipitates larger than 0.1μ. When β-precipitates were smaller than 0.1μ no dimple was found on grain boundaries.<br>Based upon the observations, it was concluded that when β-precipitates were small (<0.1μ), ductile transgranular fracture was the main mode of fracture and when β-precipitates were large (>0.1μ), grain boundary fracture controlled the toughness of Al-Mg alloys at low temperature.
Journal
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- Journal of Japan Institute of Light Metals
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Journal of Japan Institute of Light Metals 25 (12), 451-458, 1975
The Japan Institute of Light Metals
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Details 詳細情報について
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- CRID
- 1390282681315894656
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- NII Article ID
- 130004207786
- 10003033321
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- NII Book ID
- AN00069773
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- COI
- 1:CAS:528:DyaE28Xhs1ygur0%3D
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- ISSN
- 18808018
- 04515994
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- NDL BIB ID
- 1687144
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL Search
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed