| Cite this article as: |
Jianyue Zhang, Xuzhe Zhao, Deʼan Meng, and Qingyou Han, Utilization of surface nanocrystalline to improve the bendability of AZ31 Mg alloy sheet, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1413-1424. https://doi.org/10.1007/s12613-022-2414-7
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Jianyue Zhang E-mail: zhang.12278@osu.edu
Qingyou Han E-mail: hanq@purdue.edu
镁合金因为其低密度和高比强度，成为新一代的结构材料。对比钢铁和铝合金，镁合金板材的弯曲成型性能相对较差。对于如何提高其成型性能成为了近年来的研究重点。表面纳米化是一种有效提高镁合金强度和表面硬度的手段，然后镁合金在表面纳米化之后，其塑性会明显降低，从而影响成型性能。 本文通过超声喷丸的方式，在镁合金的表面制备了不同厚度（51–145 µm）的纳米层，研究了表面纳米化之后的AZ31镁合金板材的V型弯曲性能。通过研究发现，双面纳米化处理的镁合金表现出和未处理相近的弯曲性能。同时，单面处理的板材表现出优于未处理板材的弯曲性能。当纳米层在弯曲过程中位于单侧处理的板材的内测，其改变了板材中性层在弯曲过程中的外移趋势，从而提高了弯曲性能，研究表明这种提高是非常有限的。在超声喷丸5 min处理的板材中，其中性层偏移最少，更厚的纳米层使得中性层偏至板材内测，从而降低弯曲性能。当纳米层在弯曲过程中位于板材的外层时，板材的弯曲性能也得以提高并且提高程度随着纳米层厚度的增加而增加。这是因为纳米材料在弯曲过程中导致了应力应变的再分布。在板材外层增加纳米层后，其弯曲顶端得到了应力更大应变更小的一种分布情况，而这种分布有利于纳米化后的板材的弯曲，从而阻止了裂纹的产生，提高了弯曲性能。
A surface nanocrystalline was fabricated by ultrasonic shot peening (USSP) treatment at AZ31 Mg alloy. The effect of nanocrystalline thickness and its placed side (external or internal) on the bendability was studied by a V-bending test. Three durations, 5, 10, and 15 min, were applied to form the surface nanocrystalline with thicknesses of 51, 79, and 145 μm, respectively. Two-side treatment led to a similar bendability as that of as-received. One-side internal treatment for 5 min resulted in an improved bendability while the improvement was limited and degenerated for longer treatment. The improvement was related to the drawing back of the neutral axis. The one-side external treatment also improved the bendability, and the improvement was due to the redistribution of strain and stress during bending. With nanocrystalline at external side, it resulted in a larger stress but a smaller strain at the convex, which prevented the happening of crack during bending.
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