Enhancement of fatigue properties of Al-Mg and Al-Mg-Si alloys at elevated temperatures by addition of small amount of Scandium

添加少量钪提高Al-Mg和Al-Mg-Si合金的高温疲劳性能

• 批准号: 19760063
• 负责人: WATANABE Chihiro
• 金额: $ 2.3万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19760063/
• 关键词: 機械材料; 金属疲労; Sc含有Al合金

The effects of small amount of Sc addition on the fatigue properties of Al-Mg and Al-Mg-Si alloys at elevated temperatures have been examined. Cyclic softening after initial hardening is found in the Al-Mg alloys with small Al_3Sc particles, but no cyclic softening takes place in the alloys with larger particles. The cyclic softening is explained by a loss of particle strengthening through particle shearing within strongly strained slip bands. The larger Al_3Sc particles have a stronger retardation effect on the formation of fatigue-induced stable dislocation structure than small particles even at a high temperature. After peak-aging treatments, the Al-Mg-Si alloys has fine lath-shaped β' precipitates. In the Sc-containing Al-Mg-Si alloy, spherical Al_3Sc precipitates of about 11 nm in diameter are co-existed. The Al-Mg-Si alloy with Sc exhibits cyclic hardening to saturation, while the alloy without Sc shows clear cyclic softening after initial hardening. In the Sc-bearing Al-Mg-Si alloy, owing to the existence of non-shearable Al_3Sc precipitates, dislocations were uniformly distributed, resulting in the improvement of fatigue life.

已经检查了少量SC添加对升高温度下Al-Mg和Al-MG-SI合金疲劳性能的影响。在具有较小的Al_3SC颗粒的Al-MG合金中发现了初始硬化后的循环软化，但是在具有较大颗粒的合金中没有循环软化。循环软化的解释是通过在严重紧张的滑动带中通过颗粒剪切的粒子剪切的损失来解释。甚至在高温下，较大的Al_3SC颗粒对疲劳诱导的稳定脱位结构的形成具有更强的延迟作用。峰值治疗后，Al-MG-SI合金具有细板条形β'S沉淀。在含SC的Al-MG-SI合金中，直径约为11 nm的球形AL_3SC沉淀被共存。带有SC的Al-MG-SI合金表现出循环硬化至饱和度，而无SC的合金在初始硬化后显示出明显的环状软化。在含有SC的Al-Mg-Si合金中，由于存在不可切除的AL_3SC沉淀物，位错均匀分布，从而改善了疲劳寿命。

项目成果

Al-Mg-Sc合金における高温疲労挙動と転位組織

Al-Mg-Sc合金的高温疲劳行为和位错结构

• 发表时间: 2007
• 作者: 渡邊千尋;石野嘉明;門前亮一
• 通讯作者: 門前亮一

Al-Mg-Sc合金の微視組織と高温疲労挙動

Al-Mg-Sc合金的显微组织及高温疲劳行为

• 发表时间: 2008
• 作者: 渡邊千尋;石野嘉章;門前亮一
• 通讯作者: 門前亮一

Low-cycle fatigue behavior of an Al-Mg-Si alloy with and without a small addition of Sc

添加和不添加少量 Sc 的 Al-Mg-Si 合金的低周疲劳行为

• 发表时间: 2010
• 期刊: Material Science forum (in press)
• 作者: C,Watanabe;R.Monzen
• 通讯作者: R.Monzen

Fatigue behavior and microstructure of an Al-Mg-Sc alloy at an elevated temperature

Al-Mg-Sc合金高温疲劳行为和显微组织

• 发表时间: 2010
• 期刊: Journal of physics CS (in press)
• 作者: C,Watanabe;R.Monzen
• 通讯作者: R.Monzen

Al-Sc系合金中のAl3Sc粒子の粗大化成長

Al-Sc合金中Al3Sc颗粒的粗化生长

• 发表时间: 2009
• 作者: Goto O;Fujishiro M;Kakushima N;Kodashima S;Ono S;Yamaguchi H;Nomura S;Kaminishi M;Omata M;渡邊千尋
• 通讯作者: 渡邊千尋