采用 Gleeble 热模拟机进行热压缩实验，研究7150铝合金在变形温度为300～450℃、应变速率为0．01～10s －1条件下的变形行为，采用 Zener-Hollomon 参数法构建合金高温塑性变形本构方程，并对变形后的微观组织进行分析。研究表明：7150铝合金的流变应力随应变速率增大而增大，随变形温度增大而降低。该合金热压缩变形的流变应力行为可用双曲正弦形式的本构方程描述，其参数 A 为4．161×1014 s －1，α为0．01956 MPa －1，n 为5．14336，热变形激活能 Q 为229．7531 kJ ／mol。随着温度升高和应变速率降低，动态再结晶逐渐取代动态回复成为合金的主要软化机制。
The flow stress behavior and the deformation microstructure of 7150 aluminum alloy during hot compression deformation were studied by thermal simulation test using Gleeble thermal simulation machine at temperature ranging from 300℃ to 450℃ and strain-rate from 0.01 s -1 to 10s -1 .The constitutive equation of the plastic deformation of 7150 alloy at elevated temperature was obtained by intro-ducing Zener-Hollomon parameter.The experimental results indicate that the flow stress and peak stress increase with increasing strain rate,and decrease with increasing deformation temperature,which can be described by a constitutive equation in hyperbolic sine func-tion,whose values of related parameters A,α,n and activation energy for hot deformation Q,are 4.161 ×10 14 s -1 ,0.01956 MPa -1 , 5.14336 and 229.7531 kJ /mol respectively.With increasing the temperature and decreasing the strain rate,the main soften mechanism of the 7150 alloy transforms from dynamic recovery to dynamic re-crystallization.
参考文献
| [1] | STARKE E A;STALEY J T .Application of modern alumi-num alloys to aircraft[J].Progress in Aerospace Sciences,1996,32:131-172. |
| [2] | 刘兵,彭超群,王日初,王小锋,李婷婷.大飞机用铝合金的研究现状及展望[J].中国有色金属学报,2010(09):1705-1715. |
| [3] | 骞西昌,杨守杰,张坤,戴圣龙.铝合金在运输机上的应用与发展[J].轻合金加工技术,2005(10):1-7. |
| [4] | 易幼平,杨积慧,蔺永诚.7050铝合金热压缩变形的流变应力本构方程[J].材料工程,2007(04):20-22,26. |
| [5] | 寇琳媛,金能萍,张辉,韩逸,吴文祥,李落星.7150铝合金高温热压缩变形流变应力行为[J].中国有色金属学报,2010(01):43-48. |
| [6] | 翁舒楚,张辉,李落星,陈容,蒋福林.7150铝合金在热压缩变形过程中的动态组织演变[J].机械工程材料,2013(05):41-45. |
| [7] | 陈康华,陈送义,彭国胜,方华婵,肖代红.变形程度对7150铝合金再结晶及性能的影响[J].特种铸造及有色合金,2010(02):103-107. |
| [8] | 罗龙,李丽荣,定巍.概述试验机Gleeble-1500D的热/力模拟技术[J].热处理技术与装备,2014(01):38-41. |
| [9] | 滑勇之,关立文,刘辛军,崔海龙.铝合金7050-T7451高温高应变率本构方程及修正[J].材料工程,2012(12):7-13. |
| [10] | 胡会娥,孔小东,陈德斌,胡裕龙.7050铝合金高温变形过程中的微观组织特征[J].材料工程,2010(11):52-56. |
| [11] | 臧金鑫,郑林斌,张坤,陶乐晓.新型超高强Al-Zn-Mg-Cu铝合金热压缩变形的流变应力行为[J].航空材料学报,2011(03):35-39. |
| [12] | 陶乐晓,臧金鑫,张坤,陈慧琴.新型高强Al-Zn-Mg-Cu合金的热变形行为和热加工图[J].材料工程,2013(01):16-20. |
| [13] | 刘晓艳,潘清林,路聪阁,李文斌,张心明,尹志民.热变形条件对含银Al-Cu-Mg耐热铝合金流变应力和组织的影响[J].航空材料学报,2009(03):27-32. |
| [14] | 孙鹏,李志辉,熊柏青,张永安,李锡武,刘红伟,王锋.喷射成形超高强铝合金热压缩过程中的流变行为[J].航空材料学报,2014(03):8-14. |
| [15] | 李成侣,潘清林,刘晓艳,何运斌,李文斌.2124铝合金的热压缩变形和加工图[J].材料工程,2010(04):10-14. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%