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轧制参数对AZ31镁合金织构和室温成形性能的影响

第24卷第8期中国有色金属学报2014年8月V olume 24 Number 8The Chinese Journal of Nonferrous Metals August 2014文章编号:1004-0609(2014)08-1953-07

轧制参数对AZ31镁合金织构和室温成形性能的影响

杨海波,胡水平

(北京科技大学高效轧制国家工程研究中心,北京100083)

摘要:为了获得基面织构强度弱化、室温埃里克森值高的镁合金板材的热轧工艺,采用异步轧制研究轧制温度为250~450 ℃、道次压下率为15%~35%、异速比为1:1.5时轧制工艺对镁合金宏观织构和室温成形性能的影响,并以此设计一组轧制工艺,使轧制后合金织构强度明显弱化,室温埃里克森值得到明显提高。结果表明:提高轧制温度、减小道次压下率可以有效地弱化基面织构,提高镁合金室温成形性能。但是在450 ℃、道次压下率为5%时,轧制后板材晶粒粗大,成形能力较低。经轧制温度为450 ℃、道次压下率为10%的工艺轧制后板材具有优良的室温成形性能,即室温埃里克森值为5.35 mm,此时基面织构强度为9852。

关键词:AZ31镁合金;织构;热轧参数;成形性能

中图分类号:TG146.2 文献标志码:A

Influence of rolling parameters on texture and formability of rolled AZ31 magnesium alloys at room temperature

YANG Hai-bo, HU Shui-ping

(National Engineering Research Center of Advanced Rolling,

University of Science and Technology Beijing, Beijing 100083, China)

Abstract: To develop the AZ31 magnesium alloy plates (sheets) with low macro-texture intensity and high Erichen value, the effects of hot rolling process on the macro-texture and formability were investigated, under the rolling temperature of 250?450 ℃, pass reduction of 15%?35% and differential ratio of 1:1.5, respectively. The results show that, with increasing the rolling temperature or decreasing pass reduction, the basal plane texture intensity declines obviously and the Erichsen value improves. However, when the pass reduction drops to 5%, the coarse grain and decreasing formability are observed in the plates after being rolled at high temperature of 450 ℃. When the rolling temperature is 450 ℃ and pass reduction is 10%, the excellent formability of AZ31 magnesium can be obtained, i.e. the Erichsen value under room temperature is 5.35 mm, the base plane texture degree is 9852.

Key words: AZ31 magnesium alloy; texture; hot rolling parameter; formability

镁合金具有低密度、高比强度和优异的减震降噪效果,在航空航天、交通、家电等领域具有广阔的应用前景[1]。尽管如此,由于受材料制备、加工技术、抗腐蚀性能以及价格等因素的制约,镁合金尤其是变形镁合金的应用量仍远远落后于钢铁和铝合金的应用量。镁是密排六方晶体结构,晶体结构对称性较低,室温下独立滑移系数量远少于立方结构金属的,室温变形条件下其棱柱面滑移和锥面滑移的临界分切应力(Critical resolved shear stress, CRSS)远大于基面滑移的[2?3],塑性变形主要靠(0002)?

?0

2

11基面滑移以及}1

1

10

{、}2

1

10

{面孪生,这是导致镁合金室温塑性较差、变形加工困难的主要原因。大量研究[4?6]表明,由于轧制镁合金在轧制平面上分布着很强的基面织构,使得镁合金板材沿着厚度方向变形困难,强烈的基面

基金项目:国家“十二五”镁合金支撑项目课题三(2011BAE22B003)

收稿日期:2013-10-15;修订日期:2014-05-20

通信作者:胡水平,副研究员,博士;电话:136********;E-mail: husp@https://www.wendangku.net/doc/a71267893.html,

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