组元厚度比对镁铝层合板力学性能与拉深性能的影响
发布时间：2019-04-27 06:42
【摘要】：金属层合板作为可以充分发挥并且利用好各组元层的金属性能的这样一种材料，目前受到了多个行业的青睐。作为“可再生资源”的镁合金，其自身的优点使其有十分广泛的应用面，，但是其自身较差的耐蚀性限制了本身的发展。而铝合金的综合性能较好，更重要的是其有很好的耐腐蚀的性能，若将二者结合将会大大提高两种材料的使用范围，使其性能更优，用途更广。5052/AZ31/5052镁铝层合板作为新型复合型材料有着广阔的应用前景。本文考虑到层合板的组元层对层合板性能影响尤为重要，并且组元层所占比重不同会对层合板的成形性能有一定影响，所以本文主要研究了两种厚度比下的镁铝层合板的力学性能和拉深性能，以此作为指导可以对镁铝层合板的设计制备提供一定借鉴。 本文首先研究了两种厚度比的层合板在四道次热轧成形下得到的厚度比和变形情况。研究表明：不同厚度比的镁铝层合板轧制后的表现均为镁板的变形比铝板变形更为容易，所以镁板的变形量占总变形量的比重较大，轧制过后铝板相对于镁板占层合板的比重上升，并且当铝板厚度由0.7mm变为0.38mm时，铝板趋于接近难变形区。 其次通过对比两种不同厚度比的镁铝层合板的力学性能基本参数和微观组织来比较何种厚度比的板材性能更好。试验结果表明：在室温条件下厚度比为1:4:1的层合板综合力学性能优于厚度比为1:7:1的层合板，表现在前者屈强比小，延伸率高，并且硬度值也略高，但是在加热温度200℃时，厚度比为1:7:1的层合板力学性能得到明显提高并且超过了厚度比为1:4:1的层合板。然而，在微观组织方面，不同厚度比的层合板的结合界面层和组织形貌呈现基本一致的情况。 最后通过比较两种厚度比的层合板在室温、200℃和230℃三种成形温度下的极限拉深比、拉深件的硬度以及最大减薄率等指标，对比分析了组元层厚度比对层合板拉深性能的影响。试验结果得知：在室温下，厚度比为1:4:1的层合板表现出更好的成形性能，其极限拉深比为1.32；然而在成形温度为200℃和230℃时，厚度比为1:7:1的层合板表现出更好的成形性能，在200℃时，其极限拉深比达到3.1优于厚度比为1:4:1得到的2.9，230℃时，厚度比为1:7:1的层合板的极限拉深比为3.0，同样高于1:4:1的2.7，并且温度升高，两种厚度比的层合板拉深能力相差值增大。可见铝合金在镁铝层合板中的占比不同会明显影响层合板在不同成形温度下的拉深性能。
[Abstract]:As a kind of material which can make full use of the metal properties of each element layer, metal laminate has been favored by many industries at present. Magnesium alloy, as a "renewable resource", has a wide range of applications due to its own advantages, but its poor corrosion resistance limits its own development. The comprehensive performance of aluminum alloy is better, and more important is that it has good corrosion resistance. The combination of the two materials will greatly improve the scope of use of the two materials, and make its properties better. 5052 / AZ31/5052 magnesium-aluminum laminate has a wide application prospect as a new composite material. In this paper, it is considered that the component layers of laminated plates are particularly important to the performance of laminated plates, and the different proportion of constituent layers will affect the formability of laminated plates to a certain extent. Therefore, the mechanical properties and drawing properties of magnesium-aluminum laminates with two thickness ratios are studied in this paper, which can be used as a reference for the design and preparation of magnesium-aluminum laminates. In this paper, the thickness ratio and deformation of two kinds of laminates with different thickness ratios are studied under four-pass hot rolling. The results show that the deformation of magnesium-aluminum laminate with different thickness ratio is easier than that of aluminum plate after rolling, so the deformation of magnesium-aluminum laminate is larger than that of aluminum plate, so the deformation of magnesium-aluminum laminate is larger than that of aluminum plate. After rolling, the proportion of aluminum plate to magnesium plate in laminate increases, and when the thickness of aluminum plate changes from 0.7mm to 0.38mm, the aluminum plate tends to approach the hard deformation region. Secondly, the mechanical properties and microstructure of two kinds of mg-Al laminates with different thickness ratios are compared to compare the thickness ratio of the plates with better mechanical properties. The experimental results show that the composite mechanical properties of the laminates with the thickness ratio of 1:4:1 at room temperature are better than those of the laminates with the thickness ratio of 1:7:1. The former has the advantages of smaller yield to strength ratio, higher elongation, and slightly higher hardness value than that of the laminates with the thickness ratio of 1:7:1. However, at the heating temperature of 200 鈩
本文编号：2466767
[Abstract]:As a kind of material which can make full use of the metal properties of each element layer, metal laminate has been favored by many industries at present. Magnesium alloy, as a "renewable resource", has a wide range of applications due to its own advantages, but its poor corrosion resistance limits its own development. The comprehensive performance of aluminum alloy is better, and more important is that it has good corrosion resistance. The combination of the two materials will greatly improve the scope of use of the two materials, and make its properties better. 5052 / AZ31/5052 magnesium-aluminum laminate has a wide application prospect as a new composite material. In this paper, it is considered that the component layers of laminated plates are particularly important to the performance of laminated plates, and the different proportion of constituent layers will affect the formability of laminated plates to a certain extent. Therefore, the mechanical properties and drawing properties of magnesium-aluminum laminates with two thickness ratios are studied in this paper, which can be used as a reference for the design and preparation of magnesium-aluminum laminates. In this paper, the thickness ratio and deformation of two kinds of laminates with different thickness ratios are studied under four-pass hot rolling. The results show that the deformation of magnesium-aluminum laminate with different thickness ratio is easier than that of aluminum plate after rolling, so the deformation of magnesium-aluminum laminate is larger than that of aluminum plate, so the deformation of magnesium-aluminum laminate is larger than that of aluminum plate. After rolling, the proportion of aluminum plate to magnesium plate in laminate increases, and when the thickness of aluminum plate changes from 0.7mm to 0.38mm, the aluminum plate tends to approach the hard deformation region. Secondly, the mechanical properties and microstructure of two kinds of mg-Al laminates with different thickness ratios are compared to compare the thickness ratio of the plates with better mechanical properties. The experimental results show that the composite mechanical properties of the laminates with the thickness ratio of 1:4:1 at room temperature are better than those of the laminates with the thickness ratio of 1:7:1. The former has the advantages of smaller yield to strength ratio, higher elongation, and slightly higher hardness value than that of the laminates with the thickness ratio of 1:7:1. However, at the heating temperature of 200 鈩
本文编号：2466767
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