等径角挤压道次对纯锡显微组织与力学性能的影响
Effect of Equal Channel Angular Pressing Pass on Microstructure and Mechanical Properties of Pure Tin
摘 要
在室温下对纯度为99.99%的锻态纯锡板进行不同道次(0~20道次)的等径角挤压(ECAP),研究ECAP道次对纯锡显微组织和力学性能的影响。结果表明:在ECAP的剧烈剪切作用下纯锡晶粒中产生孪晶,并发生孪晶诱导再结晶,晶粒显著细化,当ECAP道次超过12道次时,晶粒细化效果减弱;随着ECAP道次的增加,纯锡的织构强度和最大取向密度降低,硬度、强度和断后伸长率均增大;与锻态纯锡相比,经20道次ECAP后的硬度、屈服强度、抗拉强度和断后伸长率分别提高了9.09%,5.14%,32.08%,144.19%;当ECAP道次数少于8道次时,纯锡的主要强化机制为加工硬化,而当ECAP道次数多于8道次时,主要强化机制为细晶强化。
纯锡
晶粒细化
力学性能
equal channel angular pressing
pure tin
grain refinement
mechanical property
Abstract
The forged pure tin plate with purity of 99.99% was treated by equal channel angular pressing (ECAP) for different passes (0-20 passes) at room temperature. The effect of ECAP pass on the microstructure and mechanical properties of the pure tin was studied. The results show that under the severe shear of ECAP, twinning and twin-induced recrystallization occurred in pure tin grains, and the grains were significantly refined. After ECAP for more than 12 passes, the grain refinement effect was weakened. With increasing ECAP pass, the texture strength and maximum orientation density of the pure tin decreased, while the hardness, strength and percentage elongation after fracture increased. Compared with those of the forged pure tin, the hardness, yield strength, tensile strength and percentage elongation after fracture after 20 passes of ECAP increased by 9.09%, 5.14%, 32.08% and 144.19%, respectively. The main strengthening mechanism of the pure tin was work hardening with ECAP pass of less than 8, and was fine grain strengthening with ECAP pass of more than 8.
中图分类号 TG146.23 DOI doi: 10.11973/jxgccl202303002
所属栏目 试验研究
基金项目 福建省自然科学基金资助项目(2020J01352)
收稿日期 2021/9/22
修改稿日期 2022/12/9
网络出版日期
作者单位点击查看
联系人作者张永皞
备注程桑(1997-),女,福建莆田人,硕士研究生
引用该论文: CHENG Sang,ZHANG Yonghao,YANG Chuan,WANG Bingshu,ZHOU Baoxue. Effect of Equal Channel Angular Pressing Pass on Microstructure and Mechanical Properties of Pure Tin[J]. Materials for mechancial engineering, 2023, 47(3): 7～11
程桑,张永皞,杨川,汪炳叔,周保雪. 等径角挤压道次对纯锡显微组织与力学性能的影响[J]. 机械工程材料, 2023, 47(3): 7～11
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【6】刘国心,魏伟,魏坤霞.等通道变形高纯铝的显微组织与力学性能[J].机械工程材料,2008,32(6):66-69. LIU G X,WEI W,WEI K X.Microstructure and mechanical properties of high purity aluminum processed by equal channel angular pressing[J].Materials for Mechanical Engineering,2008,32(6):66-69.
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【9】HE F,WANG Z J,WU Q F,et al.Tuning the defects in face centered cubic high entropy alloy via temperature-dependent stacking fault energy[J].Scripta Materialia,2018,155:134-138.
【10】WEI Y J,LI Y Q,ZHU L C,et al.Evading the strength-ductility trade-off dilemma in steel through gradient hierarchical nanotwins[J].Nature Communications,2014,5:3580.
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【13】VALIEV R Z,LANGDON T G.Principles of equal-channel angular pressing as a processing tool for grain refinement[J].Progress in Materials Science,2006,51(7):881-981.
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