Preparing method for high-performance magnesium alloy bar

Abstract

The invention discloses a preparing method for a high-performance magnesium alloy bar. The method comprises the following steps that a magnesium alloy raw blank is ground, subjected to homogenizationtreatment, pretreated and preheated, groove rolling machining is conducted, the roller speed ranges from 0.1 m / s to 0.5 m / s, 6-10 rolling passes are adopted, the area of each pass is reduced by 19.8%-24.6%, and the accumulated reduction amount is 71.9%-88.0%. In the groove rolling process, the rhombic hole pass and the square hole pass are alternately conducted, and square hole rolling is adoptedas final rolling; and after rolling of each pass is finished, rolling of the next pass is immediately conducted after the bar is rotated by 90 degrees. After groove rolling is finished, room-temperature cooling is conducted. According to the preparing method, the toughness of the alloy can be obviously improved, and the anisotropy of the alloy is improved. Meanwhile, the multi-direction deformation effect is improved through the adopted novel hole pattern, large strain can be more effectively guided in, the production efficiency is improved, and the preparing method is suitable for producing the high-performance magnesium alloy material in the industrial short process.

Description

technical field [0001] The invention relates to a deformation processing technology for high-performance magnesium and its alloy rods, in particular to a method for improving the mechanical properties of magnesium and its alloy rods by using multi-pass rolling, which belongs to the field of new metal material technologies. Background technique [0002] Magnesium alloy is currently the lightest metal structure material (density of 1.74g / cm 3 ), high specific strength, good impact resistance and damping performance, wide range of sources and easy processing and recycling, it has become one of the fastest growing materials for industrial applications at home and abroad. In recent years, with the advancement of energy-saving and emission-reduction measures, especially the introduction of the timetable for banning the sale of traditional fuel vehicles in various countries, the advantages of magnesium alloys in lightweight applications in the transportation field have become more ...

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Problems solved by technology

However, the current research on the application of this method to prepare ultrafine-grained magnesium alloys is still very limited, and most of them focus on the microalloying system. For example, T.Mukai et al. After the alloy was groove rolled for 18 passes at 200°C and 0.5m / s rolling conditions, its yield strength increased to twice that of the original extruded state, and at the same time the anisotropy decreased significantly, but the rolling passes were too many, That is, the strain accumulation efficiency is not high, and it is often limited and difficult to be widely used in actual industrial production (Strengthening Mg-Al-Zn alloy by repetitive oblique shear strain with caliberroll[J].Scripta Materialia,2010,62(2):113-116 .)

In addition, A.Tripathi et al. used a similar pass design to study the as-rolled Mg-3Al-1Zn-0.2Mn (wt.%) alloy. After the pass), the yield strength of the alloy increased from 159MPa to 310MPa, but its elongation was reduced to half of the original 12% (Microstructure and texture evolution in AZ31 magnesium alloy during caliber rolling at different temperatures[J]. Journal of Magnesium and Alloys, 2017)

[0007] To sum up, in the existing research on groove rolling of magnesium alloys, either the effect is not good enough to meet the engineering requirements, or the efficiency is not high enough to be widely used, which limits its application in production

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