立方织构对新型Al-Mg-Si-Zn合金面内各向异性的影响
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摘要
报道了一种工厂试制的新型车身用Al-Mg-Si-Zn板材,该板材表现出强烈的面内各向异性(Δr=0. 39),X射线衍射分析显示这种各向异性源于成品板内强烈的立方织构。通过跟踪观察从工厂试制热轧板到成品板各阶段的织构演变,明确了导致成品板立方织构强烈的原因。研究发现,工业试制热轧板中已经存在一定量的立方织构。在后续冷轧、中间退火、最终冷轧与固溶处理过程中,热轧过程中已存在的立方织构的强度呈现波形变化,尤其是在中间退火过程显著增强。采用相同的热轧后续工艺,实验室制备的Al-Mg-Si-Zn板材展现了与工业试制板材相近的织构演变规律。实验室制备板材显示,在不改变热轧板与成品板厚度的前提下,最终冷轧率的改变(60%～80%)难以改善板材的面内各向异性。
A new Al-Mg-Si-Zn alloy designed for automotive outer panel was trial-produced with industrial procedure. The final product shows a strong planar anisotropy. X-ray diffraction analysis shows such strong anisotropy is caused by the dominating cube texture component in the final product. The reason for such high cube texture component was investigated by tracing texture evolution starting from the hot roll slab( HRS). It is found that certain cube texture components already exists in the hot rolled slab. The strength of cube texture component shows as a wavy change through the following 1 stcold rolling,inter-annealing,2 ndcold rolling and solution treatment. This study shows that the cold rolling in the laboratory can well represent the texture evolution during the industrial production. The results obtained by lab rolling hints that change of second cold rolling reduction has weak effect on the planar anisotropy,when the gauge of hot rolled slab and final sheet are fixed.
A new Al-Mg-Si-Zn alloy designed for automotive outer panel was trial-produced with industrial procedure. The final product shows a strong planar anisotropy. X-ray diffraction analysis shows such strong anisotropy is caused by the dominating cube texture component in the final product. The reason for such high cube texture component was investigated by tracing texture evolution starting from the hot roll slab( HRS). It is found that certain cube texture components already exists in the hot rolled slab. The strength of cube texture component shows as a wavy change through the following 1 stcold rolling,inter-annealing,2 ndcold rolling and solution treatment. This study shows that the cold rolling in the laboratory can well represent the texture evolution during the industrial production. The results obtained by lab rolling hints that change of second cold rolling reduction has weak effect on the planar anisotropy,when the gauge of hot rolled slab and final sheet are fixed.
引文
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[4]Engler O,Hirsch J.Materials Science and Engineering A[J],2002,336:249-262.
[5]Randle V,Engler O.Introduction to Texture Analysis:Macrotexture,Microtexture and Orientation Mapping[M].Amsterdam:Gordon and Breach Science Publishers,2000.
[6]Tian N,Zhao G,Nie B,et al.Materials Science Forum[J],2012,702-703:356-359.