初始取向对Zr-Sn-Nb合金组织及变形机制的影响  

Effect of initial orientation on microstructure and deformation mechanism of Zr-Sn-Nb alloy

作　　者：王恒元 张聪惠[1] 朱文光 刘帅洋 张津 WANG Heng-yuan;ZHANG Cong-hui;ZHU Wen-guang;LIU Shuai-yang;ZHANG Jin(College of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710000,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710000

出　　处：《塑性工程学报》2025年第3期219-228,共10页Journal of Plasticity Engineering

基　　金：陕西省重点产业链项目(2023-ZDLGY-20);陕西省创新人才推进计划-科技创新团队(2023-CX-TD-50)。

摘　　要：对Zr-Sn-Nb合金板材在室温下沿法向-轧向面和法向-横向面进行不同变形量的轧制,采用电子背散射衍射(EBSD)和晶内取向差转轴(IGMA)法表征了轧制过程中的微观组织和织构演变,分析了塑性变形机制。结果表明:轧制过程中,软取向晶粒首先发生塑性变形,晶粒逐渐发生破碎,位错密度随变形量增大而增加。同时,晶粒取向也逐渐向<0001>//ND方向倾转。TD试样在30%轧制变形量时已形成基面双峰织构,而RD试样则在轧制过程中先形成基面织构又转变为基面双峰织构。变形量不同,合金主导的变形模式也不同。变形量较小时,柱面滑移是Zr-Sn-Nb合金主要的塑性变形模式。随着变形量的增大,基面和锥面滑移逐渐为合金塑性变形做出更大贡献。相较于TD试样,RD试样轧制过程中更容易激活基面或锥面滑移。Zr-Sn-Nb alloy sheets were rolled with different deformations along normal direction-rolling direction plane and normal direc-tion-transverse direction plane at room temperature,microstructural and textural evolution during the rolling process and plastic deforma-tion mechanism were characterized and analyzed by electron backscatter diffraction(EBSD)and in-grain misorientation axis(IGMA)methods.The results show that soft oriented grains undergo plastic deformation firstly,grains are gradually fragmented,and dis-location density increases with the increase of deformation during the rolling process.Meanwhile,grain orientation is gradually tilted to the<0001>//ND direction.TD samples form a basal bimodal texture with deformation of 30%,whereas a basal texture is formed initially and then transformed to a basal bimodal texture in RD samples during rolling process.The dominant deformation mode of alloy varies depending on the deformation.Prismatic slip is the main deformation mode of Zr-Sn-Nb alloy during rolling with small deformation.As rolling deforma-tion increases,basal and pyramidal slip are activated within more grains.Compared with TD samples,basal or pyramidal slip is more likely to be activated in RD samples during rolling process.

关 键 词：Zr-Sn-Nb合金 初始取向 织构演变 变形机制 

分 类 号：TG146.4[一般工业技术—材料科学与工程]