Damping capacity and its mechanisms of ultrafine-grained structural materials produced by ARB process.

ARB工艺制备的超细晶结构材料的阻尼能力及其机理

• 批准号: 15360366
• 负责人: MINAMINO Yoritoshi
• 金额: $ 8.64万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360366/
• 关键词: ARB; internal friction; severe plastic deformation; dislocation; ultrafine grain; strength; annealing; recrystallization; 制振特性; 磁壁; 強加工材; 圧延; 防振特性; IF鋼; 1100合金

This research was made in 2003 to 2005 to investigate the damping properties of structural metals with ultrafine grains fabricated by Accumulative Roll-Bonding (ARB) process and to clarify their damping mechanisms. The materials of pure aluminum (1100 Al), Ni, low carbon IF steel with Ti element and Fe-Cr-Al alloys were severely deformed by up to an equivalent strain (e) of 4.8 by the ARB process to have the ultrafine grain structures to about 0.1um in diameter. The severely deformed materials were annealed at various temperatures for 30min to change the structures of metals. They were observed by transmission electron microscopy, magnetic measurement, tensile test, microVickers measurement and internal friction measurement.Internal friction (Q^1) of Al and Ni increased with increasing amount of deformation. The deformed materials of e=3.2 had the quite high Q^1 of 6.6×10^<-3> and it kept about constant against the deformation. These internal frictions were explained as follows. The di … More stance of the dislocation motion under vibration stress seemed to be small due to the smallness of the grain size. The change in the Q^1 with number of the ARB cycles was attributed to the changes in the dislocation density and the distance of dislocation motion under vibrating stress which is controlled by the pinning points and the grain boundaries. As for the internal friction of IF steel, the Q^1 was 1.4×10^<-3> for IF steel with grains of 22um in diameter, 1.6×10^<-3> for that of 0.4um and 1.8×10^<-3> for that of 0.2um ; that is, the internal friction increased with decreasing diameter of grains. On the other hand, the strengths were 270MPa for the IF steel with grains of 22um in diameter and 900MPa for 0.2um ; that is, the strength increased by 3 times with decreasing diameter of grains. The internal friction were decreased to 1.57×10^<-3> by the annealing at 873K, but it recovered to be 1.72×10^<-3> by the annealing at 973K. Thus, the strength of IF steel with ultrafine grains becomes by three times higher than that of the ordinary IF steel and its damping property is improved to increase by 30% when compared with the ordinary IF steel. Because this damping for the IF steel occurs due to the dislocation damping mechanism, the control in the amounts of dislocation density, mobility and wipe area can increase the strength and damping ability of IF steel. As for the Fe-Cr-Al alloys, the strength of Fe-Cr-Al alloys increased to twice of the strength of the ordinary Fe-Cr-Al alloy due to the ultrafine grains structure of about 0.11um in diameter, while its internal friction was lowered to half. However, after the annealing near 773K, the internal friction increased largely although the strength retains constant or little decreased. This reason is that the strength is lowered little due to small change in grain size, and the internal friction is increased by the increment in the magnetic wall shift. Thus, it was found from this research project, grant- in-aid for scientific research that the high performance damping materials can be produced by the combination of severe plastic deformation and annealing. Less

本研究于2003年至2005年进行，旨在研究累积叠轧复合（ARB）工艺制备的超细晶结构金属的阻尼性能，并阐明其阻尼机理。采用ARB工艺对纯铝（1100 Al）、Ni、含Ti低碳IF钢和Fe-Cr-Al合金材料进行了大变形，变形量达4.8，得到了直径约为0.1 μ m的超细晶组织。将严重变形的材料在不同温度下退火30 min，以改变金属的结构。通过透射电镜、磁性测量、拉伸试验、显微维氏硬度测量和内耗测量等方法对变形前后的合金进行了观察，结果表明，随着变形量的增加，合金的内耗（Q^1）增大。e=3.2的变形材料具有相当高的Q^1，为6.6×10^<-3>，并且对于变形几乎保持不变。这些内部摩擦解释如下。的di ...更多信息 由于晶粒尺寸小，在振动应力下位错运动的姿态似乎很小。Q^1随ARB循环次数的变化归因于位错密度和位错在振动应力下运动距离的变化，而振动应力是由钉扎点和晶界控制的。对于IF钢的内耗，晶粒直径为22 μ m的IF钢的Q^1为1.4×10^<-3>，晶粒直径为0.4 μ m的IF钢的Q^1为1.6×10^<-3>，晶粒直径为0.2 μ m的IF钢的Q^1为1.8×10^<-3>，即随着晶粒直径的减小，内耗增大。晶粒直径为22 μ m的IF钢强度为270 MPa，晶粒直径为0.2 μ m的IF钢强度为900 MPa，即随着晶粒直径的减小，强度提高了3倍。在873 K退火时，合金的内耗降低到1.57×10^<-3>，而在973 K退火时，合金的内耗又恢复到1.72×10^<-3>。因此，具有超细晶粒的IF钢的强度变得比普通IF钢的强度高三倍，并且其阻尼性能得到改善，与普通IF钢相比增加了30%。由于IF钢的这种阻尼是由位错阻尼机制引起的，因此控制位错密度、迁移率和擦拭面积的量可以提高IF钢的强度和阻尼能力。对于Fe-Cr-Al合金，由于其具有直径约为0.11 μ m的超细晶粒结构，使其强度提高到普通Fe-Cr-Al合金的两倍，而其内耗降低到普通Fe-Cr-Al合金的一半。而在773 K附近退火后，虽然强度保持不变或略有下降，但内耗大幅度增加。这是因为晶粒尺寸的微小变化导致强度几乎没有降低，而磁壁位移的增加则增加了内摩擦。因此，从本科研资助项目中发现，采用剧烈塑性变形和退火相结合的方法可以制备出高性能的阻尼材料。少

项目成果

High-Damping Capacity of Ultra-Fine Grained Aluminium Produced by Accumulative Roll-Bonding (ARB)

累积轧制 (ARB) 生产的超细晶粒铝的高阻尼能力

• 发表时间: 2003
• 期刊: Journal of Alloys and Compounds 355
• 作者: Y.Koizumi;M.Ueyama;N.Tsuji;Y.Minamino;K.Ota
• 通讯作者: K.Ota

繰り返し重ね接合圧延(ARB)により結晶粒超微細化されたニッケルの内部摩擦

通过反复搭接轧制（ARB）使晶粒超细化的镍的内摩擦

• 发表时间: 2005
• 期刊: 日本金属学会誌 69
• 作者: 小泉 雄一郎;植山 将宜;辻 伸泰;南埜 宜俊;太田 健一
• 通讯作者: 太田 健一

Internal Friction of Ultrafine-Grained Nickel Produced by Accumulative Roll-Bonding (ARB)

累积轧制（ARB）生产的超细晶镍的内摩擦

• 发表时间: 2005
• 期刊: Journal of the Japan Institute of Metals 69, 11
• 作者: Yuichiro Koizumi;Masanori Ueyama;Nobuhiro Tsuji;Yoritoshi Minamino;Ken'ichi Ota
• 通讯作者: Ken'ichi Ota

Y.Koizumi, M.Ueyama, N.Tsuji, Y.Minamino, K.I.Ota: "High Damping Capacity of Ultra-Fine Grained Aluminum Produced by Accumulative Roll Bonding"J.Alloys and Compounds. 355. 47-51 (2003)

Y.Koizumi、M.Ueyama、N.Tsuji、Y.Minamino、K.I.Ota：“通过累积滚压接合生产的超细晶粒铝的高阻尼能力”J.合金和化合物。