高ひずみ加工法によるAl-5Mg合金の超微結晶化と疲労挙動のその場SEM観察

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Author: 北川, 和夫ほか

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Publication date: 2001-10-22

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Note (General)：: 金沢大学理工研究域機械工学系結晶粒を微細化することによって、金属材料の機械的性質は向上することはよく知られている。微細化法の一種であるECAE(Equal-Channel Angular ExtrusionまたはECAP(Equal-Channel Angular Pressing))法は、側方押し...

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Material Type: 文書・図像類
Title: 高ひずみ加工法によるAl-5Mg合金の超微結晶化と疲労挙動のその場SEM観察
Author/Editor: 北川, 和夫
Kitagawa, Kazuo
Author Heading: 北川, 和夫
Kitagawa, Kazuo
Publication Date: 2001-10-22
Publication Date (W3CDTF): 2001-10-22
Alternative Title: Study on Fatigue Properties of Al-Mg Alloy Produced by Severe Plastic Deformation by means of In-Situ SEM Observation
Periodical title: 平成11(1999)年度科学研究費補助金基盤研究(C) 研究成果報告書概要 = 1999 Fiscal Year Final Research Report Summary
No. or year of volume/issue: 1998-1999
Volume: 1998-1999
Pages: 3p.-
Text Language Code: jpn
Subject Heading: 微結晶
ECAE法
A5056合金
低サイクル疲労
高サイクル疲労
疲労き裂
fine grain
ECAE
A5056 alloy
low cycle fatigue
high cycle fatigue
fatigue crack
Target Audience: 一般
Note (General): 金沢大学理工研究域機械工学系
結晶粒を微細化することによって、金属材料の機械的性質は向上することはよく知られている。微細化法の一種であるECAE(Equal-Channel Angular ExtrusionまたはECAP(Equal-Channel Angular Pressing))法は、側方押し出し法とも呼ばれ、通常の多結晶素材に強ひずみを繰り返し導入することができるので、高強度の材料を得ることが期待できる。本研究課題では、A5056アルミニウム合金を素材として、溶体化処理材(A5056-O材)をECAE法により微結晶化した材料(A5056-ECAE材)を製作し、それらの引張り試験、および疲労試験を実施し、強度特性についてA5056-O材およびA2024-T3材と比較検討した。得られた成果は以下のとおりである。1.ECAP法により、粒径が1ミクロン以下の素材を得ることができた。2.A5056-ECAE材の引張り強さは442MPaであり、A2024-T3材と同程度であったが、伸びは7%であり、A2024-T3材の半分以下であった。3.A5056-ECAE材の低サイクル疲労特性は、A5056-O材とA2024-T3材の中間であった。4.A5056-ECAE材の高サイクル疲労特性は、高応力振幅側ではA5056-O材およびA2024-T3材よりも優れていたが、疲れ限度に関しては有意の差は見られなかった。5.A5056-ECAE材の疲労亀裂伸展速度はA5056-O材およびA2024-T3材の約2倍程度大きかった。6.A5056-ECAE材において、繰り返し変形に起因すると思われる回復や再結晶が部分的に生じた。7.疲労亀裂伝播特性にはいずれの材料ともパリス則が成立していた。
There have only been a limited number of studies on the fatigue behavior of ultra-fine grained materials with nano- or sub-microcrystalline structure and no reports are available on the fatigue of Equal-Channel Angular Extrusion (ECAE) Al-alloys. The purpose of the present work is to explore cyclic properties of 5056 Al-alloy after ECAE treatment and to get a better insight on general fatigue and tensile performance of materials with fine-grain metastable structures produced by severe deformation. Since the influence of technological parameters on the resultant ECAE structure and properties has not been fully understood yet and is currently being extensively investigated, we do not believe that the results presented here are the best obtainable with the ECAE technology on the Al-alloys. We attempt to clarify both the benefit and draw back of ECAE for fatigue Properties to provide a guideline for further development of this process towards enhancement of practical characteristics of mat erials.Mechanical properties and fatigue performance of 5056 A1-Mg alloy fabricated by the ECAE are assessed in tensile and cyclic experiments in terms of yield stress, ultimate tensile strength, elongation, fatigue limit, S-N curve and fatigue growth rate.1) The modest enhancement of fatigue performance is achieved in the high stress regime in the fine-grain 5056 A1-Mg alloy if compared with the conventional O-temper material having a relatively large grain size. This advantage is, however, to a large extent discredited by a higher crack growth rate at low and intermediate stresses, lower apparent fatigue threshold and lower thermal stability of the severely predeformed alloy.2) The ECAE technique, in its form Used for the present work, does not reveal a distinct advantage for high-cyclic fatigue when compared with standard processing. Although this result may look discouraging, there is an obvious enhancement of the fatigue life in the low cyclic regime and of the crack growth rate at large stress intensity factor range. Additionally we have to bear in mind that the flexibility to vary many parameters during equal-channel pressing provides perspective possibilities for microstructure control and, therefore, for materials design. Further development of ECAE processing is necessary to improve fatigue and/or tensile performance of ECAE Al-alloys.
研究課題/領域番号:10650690, 研究期間(年度):1998-1999
出典：研究課題「高ひずみ加工法によるAl-5Mg合金の超微結晶化と疲労挙動のその場SEM観察」課題番号10650690（KAKEN：科学研究費助成事業データベース（国立情報学研究所））（https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-10650690/106506901999kenkyu_seika_hokoku_gaiyo/）を加工して作成
DOI: 10.24517/00057067
Access Restrictions: 限定公開
Related Material: https://kaken.nii.ac.jp/search/?qm=30019757
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650690/
https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-10650690/106506901999kenkyu_seika_hokoku_gaiyo/
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 金沢大学 : 金沢大学学術情報リポジトリKURA