等径角挤压处理后的Mg-Gd-Y-Zr合金的微观组织和力学性能(英文)

• 作 者: 张帆 张可翔 谭成文 于晓东 马红磊 王富耻 才鸿年
• 机 构: 北京理工大学材料科学与工程学院,中国航天员科研训练中心先进材料行为特性实验室,
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2011年10期
• 关键词: 微观组织 等径角挤压 晶粒尺寸 织构 第二相颗粒 力学性能 ECAP 合金塑性 镁合金 texture

研究等径角挤压过程中材料的微观组织和织构演变以及对其力学性能的影响。结果表明:挤压4道次后的微观组织是不均匀的,即在此过程中形成了粗晶区和细晶区2个区域。颗粒诱发的再结晶机制导致晶粒细化,在4道次后形成了更加随机的织构。与挤压前的原始材料相比较,经等径角挤压处理的材料虽然强度没有增加,但是塑性有了显著的提高。用织构改变和第二相颗粒解释了合金塑性的变化。

The microstructure and texture evolution of the material during isobaric angle extrusion and the effect on the mechanical properties of the material were investigated. The results show that the microstructures after 4 passes of extrusion are inhomogeneous, that is, two regions of coarse grains and fine grains are formed during this process. Particle-induced recrystallization leads to grain refinement, forming a more random texture after 4 passes. Comparing with the original material before extrusion, the plasticity has been significantly improved although the strength of the material processed by iso-angle extrusion did not increase. The change in the plasticity of the alloy is explained by texture changes and second-phase particles.