The Effect of Scandium on Thermal Stability and Fatigue Behavior of Ultra Fine Grained Al-Mg-Sc Alloy Produced by Severe Plastic Deformation

钪对强塑性变形超细晶Al-Mg-Sc合金热稳定性和疲劳行为的影响

• 批准号: 12650695
• 负责人: KITAGAWA Kazuo
• 金额: $ 2.18万
• 依托单位: KANAZAWA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650695/
• 关键词: ultra fine grain; Al-Mg alloy; Eual Channel Angular Pressing; scandium; zerconium; thermal stability; fatigue behavior; Sc; Zr; 微結晶; Torsion Straining法; Al-Mg-Sc合金; 硬さ特性; 集合組織

The fatigue properties and thermal stability of fine grained Al-Mg-Sc-Zr alloy produced by equal-channel Angular Pressing (ECAP) are explored. The grain size are reduced to about 0.3 μm by ECAP processing. Comparing with ordinary Al-Mg alloy (5056 Aluminum alloy), in high cycle fatigue regime Al-Mg-Sc-Zr exhibits higher fatigue limit. On the other hand, low cycle fatigue life of Al-Mg-Sc-Zr alloy is shorter than that of 5056 aluminum alloy. Structural changes of these alloys during fatigue tests were investigated by transmission electron microscopy. It is shown that the fine structure of Al-Mg alloy achieved during processing is unstable and tend to relax with cycling, resulting in local recovery. In contrast there is no substantial microstructure changes in Al-Mg-Sc-Zr alloy after fatigue. Furthermore -result of microhardness measurements after annealing reveals that structure of Al-Mg-Sc-Zr alloy is stable up to 773K. These observations prove that presence of Al3(Sc, Zr) precipitates improves alloy quality in terms of both mechanical and thermal stability.

研究了等通道转角挤压（ECAP）制备的细晶Al-Mg-Sc-Zr合金的疲劳性能和热稳定性。通过ECAP加工，晶粒尺寸减小到0.3 μm左右。与普通Al-Mg合金（5056铝合金）相比，Al-Mg-Sc-Zr合金在高周疲劳区具有较高的疲劳极限。另一方面，Al-Mg-Sc-Zr合金的低周疲劳寿命比5056铝合金的低周疲劳寿命短。用透射电镜研究了这些合金在疲劳过程中的组织变化。结果表明，在加工过程中获得的Al-Mg合金的精细结构是不稳定的，并倾向于松弛与循环，导致局部回复。而Al-Mg-Sc-Zr合金在疲劳后的显微组织没有明显的变化。退火后的显微硬度测试结果表明，Al-Mg-Sc-Zr合金的组织在773 K以下是稳定的。这些观察结果证明，Al 3（Sc，Zr）沉淀物的存在改善了合金在机械和热稳定性方面的质量。

项目成果

V.Patlan, A.Vinogradov, K.Higashi, K.Kitagawa: "Overview of fatigue properties of fine grain 5056 Al-Mg alloy processed by equal channel angular pressing"Material Science & Engineering. A300. 171-182 (2001)

V.Patlan、A.Vinogradov、K.Higashi、K.Kitakawa：《等通道角冲压加工细晶5056铝镁合金的疲劳性能概述》材料科学

V.Patlan, K.Higashi, K.Kitagawa et al.: "Cyclic response of fine grain 5056 Al-Mg alloy processed by equal-channel angular pressing"Material Science & Engineering. A319-321. 587-591 (2001)

V.Patlan、K.Higashi、K.Kitakawa等人：《等通道角挤压加工细晶5056铝镁合金的循环响应》材料科学

A.Washikita: "Tensile and Fatigue Properties of Al-Mg-Sc-Zr alloy Fine-Grained by Equal-Channel Angular Pressing"Proceeding of TMS Annual Meeting. 341-350 (2002)

A.Washikita：“等通道角压细晶Al-Mg-Sc-Zr合金的拉伸和疲劳性能”TMS年会论文集。

出村良広, 北川和夫, 川添正孝: "ECAE法により作製した5056アルミニウム合金の高サイクル疲労特性"軽金属. 51・6. 324-328 (2001)

Yoshihiro Demura、Kazuo Kitakawa、Masataka Kawazoe：“ECAE 方法制备的 5056 铝合金的高循环疲劳性能”轻金属 51・6（2001）。

Y. Demura: "High cycle fatigue propertie of 5056 aluminum alloy produced by Equal-Channel Angular Extrusion (in Japanese)"J. Japan Instiyute of Light Metals. 51. 324-328 (2001)

Y. Demura：“等通道角挤压生产的 5056 铝合金的高周疲劳性能（日文）”J.