采用φ=90°,ψ=30°的等通道转角挤压(ECAP)模具,对工业纯铝L2进行多次挤压,并利用悬臂梁共振法测试了合金阻尼.结果发现,ECAP可以改善材料微观组织结构,显著细化晶粒.原始晶粒尺寸为1mm的L2合金经挤压4道次后晶粒可细化为1μm左右的等轴晶.ECAP可提高合金阻尼.经挤压4道次后合金阻尼最高,应变量为3.8×10-5时合金阻尼为3.1×10-3,与未挤压的L2合金相比,提高了80%.L2合金挤压前后的阻尼是应变振幅相关的,随应变振幅增大,合金阻尼提高.
参考文献
| [1] | Segal VM. .MATERIALS PROCESSING BY SIMPLE SHEAR[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1995(2):157-164. |
| [2] | Valiev R Z;Krasilnikov N A;Tsenev N K .Plastic deformation of alloys with submicron-grained structure[J].Materials Science and Engineering A,1991,137(15):35-40. |
| [3] | 刘咏,唐志宏,周科朝,李志友.纯铝等径角挤技术（Ⅱ）--变形行为模拟[J].中国有色金属学报,2003(02):294-299. |
| [4] | Stolyarov V V;Lapovok R;Brodova I G;Thomson P F .Ultrafine-grained Al-5wt% Fe alloy processed by ECAP with backpressure[J].Materials Science and Engineering A,2003,357(01):159-167. |
| [5] | Valiev R Z;Korznikov A V;Mulyukov R R .Structure and properties of ultrafine-grained materials produced by severe plastic deformation[J].Materials Science and Engineering A,1993,168(02):141-148. |
| [6] | DONG HYUK SHIN;INYOUNG KIM;JONGRYOUL KIM .GRAIN REFINEMENT MECHANISM DURING EQUAL-CHANNEL ANGULAR PRESSING OF A LOW-CARBON STEEL[J].Acta materialia,2001(7):1285-1292. |
| [7] | Lee S.;Furukawa M.;Horita Z.;Langdon TG. .Developing a superplastic forming capability in a commercial aluminum alloy without scandium or zirconium additions[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):294-301. |
| [8] | 张忠明 .合金材料的阻尼性能及疲劳特性的研究[D].西安:西安理工大学,2003. |
| [9] | 黄正华 .AZ91D-M镁合金组织与性能的研究[D].西安理工大学,2004. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%