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Grain structure and microtexture evolution during superplastic deformation of 5A90 Al-Li alloy 被引量:7
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作者 张盼 叶凌英 +3 位作者 张新明 顾刚 蒋海春 吴豫陇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2088-2093,共6页
The microstructural evolution of banded 5A90 A1-Li alloy during superplastic deformation at 475℃ with an initial strain rate of 8× 10^-4 S^-1 was studied using EBSD technique. The results showed that, before def... The microstructural evolution of banded 5A90 A1-Li alloy during superplastic deformation at 475℃ with an initial strain rate of 8× 10^-4 S^-1 was studied using EBSD technique. The results showed that, before deformation, the grain shape appeared to be banded, the most grain boundaries belonged to low-angle boundaries, and the initial sheet had a dominate of { 110}(112) brass texture. During deformation, there were grain growth, grain shape change, misorientation increasing and textural weakening. The fraction of high-angle boundaries increased rapidly once the flow stress reached the peak value. Corresponding deformation mechanism for various stages of deformation was suggested. Dislocation activity was the dominant mechanism in the first stage, then dynamic recrystallization occurred, and grain rotation was expected as an accommodation for grain boundary sliding (GBS). At large strains, GBS was the main mechanism. 展开更多
关键词 5a90 al-li alloy SUPERPLASTICITY MICROSTRUCTURE MICROTEXTURE
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Microstructure and texture characterization of superplastic Al-Mg-Li alloy 被引量:4
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作者 李红萍 叶凌英 +2 位作者 张盼 钟掘 黄明辉 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2079-2087,共9页
A novel thermomechanical processing was developed for producing fine grained Al-Mg-Li alloy sheets. The influences of static recrystallization annealing on the grain structure and superplastic behavior were investigat... A novel thermomechanical processing was developed for producing fine grained Al-Mg-Li alloy sheets. The influences of static recrystallization annealing on the grain structure and superplastic behavior were investigated. The results show that the refined microstructure has a variation in the distribution of grain size, shape and texture across the normal direction of the sheet. The surface layer (SL) has fine, nearly equiaxed grains with a rotated cUbeND {001 }(310) orientation, whereas the center layer (CL) has coarse, elongated grains with a portion of a fiber orientation. Increasing static recrystallized temperature results in grain growth in the full thickness, decreasing of grain aspect ratio in the center layer, texture sharpening in the surface layer, but weakening in the center layer as well as decreasing of superplastic elongation. Increasing the annealing temperature also produces an sharpening of the rotated cube {001}(310) component and a decreasing of the a fiber texture in the full thickness of the sheet. The formation mechanisms of recrystallization texture at various temperatures and layers were discussed. 展开更多
关键词 5a90 al-li alloy thermomechanical processing TEXTURE SUPERPLASTICITY RECRYSTALLIZATION
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5A90 Al-Li合金桁条电流自阻加热成形技术 被引量:3
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作者 肖寒 张凯锋 +3 位作者 姜巨福 王博 易卓勋 赖小明 《锻压技术》 CAS CSCD 北大核心 2017年第7期66-71,共6页
Al-Li合金具有密度低、比强度高等优点,是实现飞行器结构减重的理想材料,在航天航空领域显示出了广阔的应用前景。先进的电加热成形技术是提高轻质合金成形性能的有效手段。通过高温拉伸实验研究了5A90 Al-Li合金的成形性能,确定了5A90 ... Al-Li合金具有密度低、比强度高等优点,是实现飞行器结构减重的理想材料,在航天航空领域显示出了广阔的应用前景。先进的电加热成形技术是提高轻质合金成形性能的有效手段。通过高温拉伸实验研究了5A90 Al-Li合金的成形性能,确定了5A90 Al-Li合金的最佳成形温度为340℃。通过电流自阻加热升温实验,得到了加热5A90 Al-Li合金板材合适的电流密度为10 A·mm^(-2)。针对5A90 Al-Li合金室温成形性能差的问题,设计并制造了5A90 Al-Li合金桁条电流自阻加热成形装置,在此装置上进行了5A90 Al-Li合金桁条的电加热成形实验,得到了符合要求的桁条零件,并分析了温度、润滑条件等对成形质量的影响。这种新型的板材电流自阻加热成形工艺及装备具有较大的实际应用价值。 展开更多
关键词 5a90 al-li合金 桁条 高温拉伸 电流自阻加热成形 润滑
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5A90 Al-Li合金板材脉冲电流辅助拉深成形 被引量:5
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作者 易卓勋 赖小明 +2 位作者 王博 张凯锋 肖寒 《锻压技术》 CAS CSCD 北大核心 2017年第8期28-32,共5页
为了解决5A90 Al-Li合金塑性加工困难的问题,通过理论分析与实验测试相结合的方法,对5A90 Al-Li合金板材的脉冲电流加热特性进行了研究。研究发现,10 A·mm^(-2)的脉冲电流可在2 min内将板材加热到300℃。通过单向拉伸试验对5A90 Al... 为了解决5A90 Al-Li合金塑性加工困难的问题,通过理论分析与实验测试相结合的方法,对5A90 Al-Li合金板材的脉冲电流加热特性进行了研究。研究发现,10 A·mm^(-2)的脉冲电流可在2 min内将板材加热到300℃。通过单向拉伸试验对5A90 Al-Li合金板材的高温力学性能进行了测试,测试结果表明,300℃时,板材的伸长率可达63.4%。以脉冲电流加热特性和高温力学性能的研究为基础,对板材试验件的成形过程进行了设计,经脉冲电流加热后成形的试验件尺寸精度满足设计要求,且表面质量良好,无裂纹、划伤等缺陷。脉冲电流辅助热成形技术为5A90 Al-Li合金钣金薄壁类零件的塑性加工提供了一条简便、高效的途径。 展开更多
关键词 5a90 al-li合金 脉冲电流 拉深成形 伸长率 单向拉伸 高温力学性能
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Electroplastic Tensile Behavior of 5A90 Al–Li Alloys 被引量:8
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作者 Pengchao Song Xifeng Li +1 位作者 Wei Ding Jun Chen 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2014年第4期642-648,共7页
The electroplastic(EP) tensile properties of 5A90 Al–Li alloys compared with thermal tension were investigated.The microstructural variation at different conditions was observed by SEM and TEM.The current density s... The electroplastic(EP) tensile properties of 5A90 Al–Li alloys compared with thermal tension were investigated.The microstructural variation at different conditions was observed by SEM and TEM.The current density significantly influences the elongation and the flow stress.With increasing current density,wider and deeper dimples on the fracture surfaces and less dislocation density and pile-ups in the EP tension samples were observed compared with roomtemperature and thermal tension,which indicates the plasticity improvement and flow stress reduction.The EP effect(EPE) mainly results from a comprehensive function of Joule heating and pure EPE.Among them,Joule heating effect is perhaps a dominant factor. 展开更多
关键词 5a90 Al–Li alloys Electroplastic effect Tensile properties Microstructure
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