Microstructure evolution of AZ91 alloy processed by a combination method of equal channel angular pressing and rolling

• 作者: Aibin Ma Chaoying Ni Jiapeng Sun Jinghua Jiang Qiong Xu Yuchun Yuan Yuhua Li
• 来源期刊: 镁合金学报(英文)
• 学科: 工学
• 关键词: AZ91 alloy ECAP and rolling “ECAP-modified”structure Second phase precipitation TEXTURE
• 年，卷（期）: 2020,（1）
• 页码范围: 192-198
• 页数: 7页
• 分类号: TG1

摘要

In the present work,AZ91 alloy was successfully processed by equal channel angular pressing(ECAP)for up to 16 passes and rolling(R)for multiple passes with a total reduction of 75%in addition to a combination method with ECAP plus rolling(ECAP+R).The effects of various processes(ECAP,R and ECAP+R)on microstructure evolution were analyzed and the influence of ECAP process on the rolling performance was examined.The result shows that ECAP contributed to a homogenous grain structure and formed a texture with higher Schmidt factors that was easy for rolling.A plate with smoother surface and reduced edge cracks was observed in the ECAP+R process than in the single R process.Although the microstructure of the alloy was similar after ECAP+R and R process,the sample of ECAP+R was more refined and had stronger second phase precipitation than the sample of R,which resulted in better rolling characteristics,along with the external surfaces.