共查询到16条相似文献,搜索用时 78 毫秒
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在室温、无润滑及总压下量相同的条件下,分别采用每道次两层叠轧和每道次三层叠轧的工艺对退火态AA1070工业纯铝板材进行了累积叠轧焊合试验,比较了最终板材界面焊合、织构和力学性能的差别。结果表明,与两层叠轧工艺相比,通过三层叠轧工艺所制备的板材金属层之间焊合状况更好,具有较强的剪切织构和轧制织构,表现出较高的伸长率和较低的抗拉强度,具有较好的综合力学性能。这些差别主要归结于三层叠轧条件下较大的道次压下量和有效剪切变形。 相似文献
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通过累积叠轧技术进行TC4合金超细晶组织的制备,考察了TC4合金的热变形特点以及叠轧工艺窗口,研究了叠轧工艺参数和热处理制度对叠轧板材界面结合和微观组织的影响。结果表明:TC4合金的应力-应变曲线表现为动态回复特征,热模拟条件下在加热温度(≥700℃)和变形速率(≤0.1s-1)下能够实现强烈塑性变形。最终TC4合金进行叠轧界面的防氧化处理后,并在加热温度为720℃、轧制速度小于0.5m/s时,获得良好的界面结合和板材质量。累积叠轧变形过程是α/β协同变形和剪切变形综合作用的结果,组织中存在拉长的条带组织以及大量的剪切带。随着叠轧层数的增加,条带组织的间距逐渐变小同时剪切带组织逐渐增加,在叠轧16层(变形量为92.3%)后条带间距为200nm~500nm之间。热处理过程中随着加热温度的增加,溶质扩散和再结晶过程促进了界面结合并最终与基体保持一致,同时叠轧16层的TC4板材在加热温度700℃、保温时间60min的热处理过程中能够实现完全再结晶,获得晶粒尺寸为300nm~600nm的超细晶组织。 相似文献
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采用了金相、电子背散射衍射(EBSD)、硬度、拉伸、杯突等试验手段研究了累积叠轧AA3003铝合金板材退火处理后的微观组织和性能。结果表明,叠轧板材在退火过程中晶粒等轴化,叠轧道次越高,退火后晶粒越细小,且退火能促使叠轧板材界面的焊合。叠轧4道次的板材随着退火温度的提高,逐渐发生再结晶和晶粒长大,强度和硬度性能逐渐降低并趋于平稳,塑性和成形性能则逐渐改善。叠轧4道次的板材再结晶完成温度约为346℃,温度低于350℃时,厚向晶粒尺寸比较均匀,但表面层和中心层织构存在明显差异;温度达到450℃时,表面层的晶粒尺寸要明显大于中心层,厚度方向组织不均匀性加大,但其织构趋于一致。 相似文献
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在叠轧等效应变为4.0的条件下得到了平均晶粒为0.5μm的Al-1%Mg合金超细晶组织;在平面深变形条件下,形成了含有大量位错的亚晶组织,大角度晶界是由于几何深变形而形成的;在热作用下,合金位错密度降低,亚晶减少,晶粒变大,在退火温度高于200℃时晶粒变化明显,低于200℃,晶粒生长比较缓慢;随着退火温度的升高,合金组织发生静态回复与静态再结晶过程,静态回复是通过位错的滑移和攀移而进行的。合金在300℃已经发生了明显的再结晶,这种再结晶是通过亚晶合并而进行的。 相似文献
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Improving mechanical properties of Mg-Al-Zn alloy sheets through accumulative roll-bonding 总被引:1,自引:0,他引:1
Experiments were conducted to evaluate the potential for improving the mechanical properties of Mg-Al-Zn alloy at room temperature by subjecting to accumulative roll-bonding(ARB). It is shown that ARB may be applied successfully to Mg-Al-Zn alloy at elevated temperatures and it leads to grain refinement and significant improvements in the ductility. The strength of the as-rolled Mg-Al-Zn alloy sheet after ARB processing is slightly decreased and basal texture is weakened by ARB processing. 相似文献
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《中国有色金属学会会刊》2020,30(9):2381-2393
The accumulative roll-bonding (ARB) process was applied on the strips of aluminum alloy 1050 in two processing conditions: cold ARB and warm ARB. The results of tensile tests and microhardness measurement show that the warm ARB process exhibits the lower tensile strength and microhardness, more homogeneous distribution of the microhardness, higher elongation, and especially superior planar isotropy of the tensile properties in comparison to the cold ARB, because of the intermediate heat treatment as well as the elevated temperature rolling in the warm ARB process. Furthermore, with increasing the cycles of both processes, the planar isotropy decreases progressively. 相似文献
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Copper sheet with grain size of 30-60μm was processed by plastic deformation of asymmetrical accumulative rolling-bonding(AARB)with the strain of 3.2.The effects of annealing temperature and time on microstructural evolution were studied by means of electron backscattered diffraction(EBSD).EBSD grain mapping,recrystallization pole figure and grain boundary misorientation angle distribution graph were constructed,and the characteristics were assessed by microstructure,grain size,grain boundary misorientation and texture.The results show that ultra fine grains(UFG)are obtained after annealing at 250℃ for 30?40 min.When the annealing is controlled at 250℃for 40 min,the recrystallization is finished,a large number of small grains appear and most grain boundaries consist of low-angle boundaries.The character of texture is rolling texture after the recrystallization treatment,but the strength of the texture is faint.While second recrystallization happens,{110}1ī2+{112}11ī texture component disappears and turns into{122}212cube twin texture component. 相似文献