|
摘要：
|
|
为了掌握高精度镁合金管材的生产工艺,通过对铸锭的均匀化处理,借助500t挤压机、拉伸试验机、金相显微镜和透射电镜(TEM)对AZ31镁合金管材的等温挤压过程进行了研究,试制了AZ31镁合金挤压薄壁管材,获得了尺寸精度高、粗糙度小和壁厚差小的管材;分析了不同挤压条件下的AZ31镁合金管材的尺寸精度、组织、力学性能。研究结果表明:在挤压温度为623±20K挤出管材经523K×3h退火时其性能较好,抗拉强度、屈服强度和延伸率分别为270MPa,175MPa和23.1%。
|
|
In order to know the production technics of magnesium alloy tube with high accuracy,the isothermal extrusion process of AZ31 magnesium alloy tube was investigated by 630 t extruder,tensile machine,microscopy and transmission electron microscope(TEM). The casting was homogenized before extrusion deformation. The tube with precise size,low roughness and little wall thickness difference was received during the trial-manufacture of the thin-wall extruded tube of AZ31 magnesium alloy. AZ31 magnesium alloy was hot extruded under different conditions,and the microstructure and mechanical properties and dimensions accuracy of the alloy were investigated. The results show that the tensile strength and yield strength and elongation percentage of samples ,that extruded at 623±20 K and annealed at 523 K×3 h are 270 MPa,175 MPa and 23.1% respectively.
|
|
基金项目：
|
|
|
|
作者简介：
|
|
|
|
参考文献：
|
[1]潘复生,韩恩厚.高性能变形镁合金及加工技术[M].北京:科学出版社,2007.
[2]陈彬,林栋樑,曾小勤,等.AZ31镁合金大压下率轧制的研究[J].锻压技术,2006,31(03):95-98.
[3]余琨,史裼,王日初,等.AZ31镁合金变形行为的热/力模拟[J].中南大学学报:自然科学版,2008,39(2):216-220.
[4]Swiostek J,Yi S B.Microstructure and texture development during hydrostatic extrusion of magnesium alloy AZ31[J].Scripta Materialia,2005,53(2):259-264.
[5]Fatemi Varzaneh S M,Zarei Hanzaki A,Beladi H.Dynamic recrystallizationin AZ31magnesiumalloy[J],Mater.Sci.Eng.A,2007,456(1-2):52-57.
[6]刘英,陈维平,张卫文,等.等通道转角挤压后AZ31镁合金的微观结构与性能[J].华南理工大学学报:自然科学版,2004,32(9):50-53.
[7]王强,张治民.坯料温度对AZ31B镁合金反挤压成形的影响[J].材料工程,2006,(增刊):310-312.
[8]何祝斌,王小松,苑世剑,等.AZ31B镁合金挤压管材的内高压成形性能[J].金属学报,2007,43(5):534-538.
[9]薛勇,张治民,郎利辉,等.AZ91D镁合金高温压缩变形行为[J].锻压技术,2009,34(1):135-138.
[10]赵欣,张奎,李兴刚,等.Mg-Y-Nd-Gd-Zr合金动态再结晶实验研究[J].稀有金属,2008,32(5):567-573.
|
|
服务与反馈：
|
|
【文章下载】【加入收藏】
|
|
|
|
