Thermo-mechanical response of Al 6061 with and without equal channel angular pressing (ECAP)

被引:119
|
作者
Khan, Akhtar S. [1 ]
Meredith, Christopher S. [1 ]
机构
[1] Univ Maryland, Dept Mech Engn, Baltimore, MD 21250 USA
关键词
Strengthening mechanisms; Rate-dependent material; Kolsky bar; Equal channel angular pressing; Aluminum; 6061; SEVERE PLASTIC-DEFORMATION; STRAIN-RATE SENSITIVITY; ULTRAFINE GRAIN SIZES; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; WIDE-RANGE; MICROSTRUCTURAL EVOLUTION; COMPRESSIVE BEHAVIOR; TEXTURE DEVELOPMENT; EXTRUSION;
D O I
10.1016/j.ijplas.2009.07.002
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The thermo-mechanical responses of Al 6061 before and after equal channel angular pressing (ECAP) at different strain rates and temperatures were measured. Al 6061 was solution heat treated before ECAP pressing at room temperature and subjected to up to three passes. After pressing, the billets were aged at 100 degrees C for 2 days. An as-received Al 6061-T651 was studied similarly to investigate the differences between processed and non-processed specimens. The responses of ECAP material were determined at -30, 22, 125 and 250 degrees C, and at strain rates from 10(-5) to 2530 s(-1): the 6061-T651 specimens were subjected to uniaxial compressive loading at -31, 22, 85,150, 230 and 315 degrees C, and strain rates ranging from 10(-5) to 2200 s(-1). It was found that, the ECAP process increases the strength versus the T651 condition. Additionally, the Al 6061 ECAP is not sensitive to strain rate at room and lower temperatures. but the sensitivity increases as the number of passes and/or temperature are increased and this is the same for the non-processed material. Increasing the number of passes increases the flow stress at room and lower temperatures, has almost no effect at 125 degrees C and decreases at 250 degrees C. For both materials. the dynamic flow stress is higher than the stress at quasi-static strain rates even when the quasi-static strain rate regime is insensitive to strain rate. The Al 6061 has strong texture after one pass but steadily increases as the number of passes are increased. This is the first study that reports on the thermo-mechanical responses of ECAP and non-ECAP Al 6061 at such a wide range of strain rates, including dynamic, and temperatures. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:189 / 203
页数:15
相关论文
共 50 条
  • [1] Texture evolution and anisotropy in the thermo-mechanical response of UFG Ti processed via equal channel angular pressing
    Meredith, Christopher S.
    Khan, Akhtar S.
    INTERNATIONAL JOURNAL OF PLASTICITY, 2012, 30-31 : 202 - 217
  • [2] Thermo-mechanical responses of an aluminum alloy processed by equal channel angular pressing
    Baig, Muneer
    El-Danaf, Ehab
    Mohammad, Jabair Ali
    MATERIALS & DESIGN, 2014, 57 : 510 - 519
  • [3] Investigating the Influence of Thermomechanical Equal Channel Angular Pressing (ECAP) Improved Die on AA-6061
    Kadiyan, Sunil
    Sharma, Seeone
    Aggarwal, Aman
    Kundu, Sombir
    Goyat, Vikas
    Ghangas, Gyander
    Prakash, Chander
    JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2024,
  • [4] Grain refinement of Al-Zn-Mg alloy during equal channel angular pressing (ECAP)
    Injor, Oryina Mbaadega
    Daramola, Oluyemi Ojo
    Adewuyi, Benjamin Omotayo
    Adediran, Adeolu Adesoji
    Ramakokovhu, Munyadziwa Mercy
    Sadiku, Rotimi Emmanuel
    Akinlabi, Esther Titilayo
    RESULTS IN ENGINEERING, 2022, 16
  • [5] Prediction of surface fracture of 6061 Al processed by equal-channel angular pressing
    Zhou, Qing
    Chen, Wenjie
    Xu, Jun
    Duan, Yupeng
    ADVANCED MATERIALS AND PROCESS TECHNOLOGY, PTS 1-3, 2012, 217-219 : 2373 - 2378
  • [6] Effect of Equal Channel Angular Pressing (ECAP) on Wear Behavior of Al-7075 Alloy
    Chegini, M.
    Fallahi, A.
    Shaeri, M. H.
    5TH INTERNATIONAL BIENNIAL CONFERENCE ON ULTRAFINE GRAINED AND NANOSTRUCTURED MATERIALS, UFGNSM15, 2015, 11 : 95 - 100
  • [7] Microstructural evolution and mechanical flow of 6061 Al during equal channel angular pressing
    Moon, BS
    Seo, MH
    Kim, YS
    Lee, KH
    Kim, HS
    Hong, SI
    METASTABLE, MECHANICALLY ALLOYED AND NANOCRYSTALLINE MATERIALS, 2002, 386-3 : 577 - 582
  • [8] Dynamic ageing and the mechanical response of Al-Mg-Si alloy through equal channel angular pressing
    Vaseghi, Majid
    Taheri, Ali Karimi
    Hong, Sun Ig
    Kim, Hyoung Seop
    MATERIALS & DESIGN, 2010, 31 (09) : 4076 - 4082
  • [9] Mechanical Properties of AI6061 processed by Equal Channel Angular Pressing
    Sahai, Ankit
    Sharma, Rahul Swarup
    HansRaj, K.
    Gupta, N. K.
    ADVANCES IN MATERIALS AND PROCESSING: CHALLENGES AND OPPORTUNITIES, 2012, 585 : 392 - +
  • [10] Microstructure and mechanical properties of magnesium alloy processed by equal channel angular pressing (ECAP)
    Gopi, K. R.
    Nayaka, H. Shivananda
    MATERIALS TODAY-PROCEEDINGS, 2017, 4 (09) : 10288 - 10292