Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第2期    总第251期    2020年2月

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文章编号:1004-0609(2020)-02-0273-10
β-ZrTiAlV合金炉冷过程中的组织演变
李飞涛1,栾佰峰1,廖仲尼1,张新宇2,刘日平2,刘 庆1

(1. 重庆大学 材料与科学工程学院 教育部轻合金材料国际联合实验室,重庆 400044;
2. 燕山大学 亚稳材料制备技术与科学国家重点实验室,秦皇岛 066004
)

摘 要: 结合EBSD和XRD,系统地研究了β-51.1Zr40.2Ti4.5Al4.2V合金在炉冷过程中3种α相(αGB、αWGB和αWI)的形核机制以及α含量对合金性能的影响。结果表明:炉冷过程中,在原β界面处具有{0001}面平行于相邻β晶粒共有{110}面取向特征的α相(αGB)会优先形核;αWGB主要以界面不稳定形核为主,通过继承αGB的取向并向原β晶内生长,从而在晶界附近形成平行板条区;为了协调相变过程中产生的形状应变,αWI通过自协作机制产生三变体团簇,且形成三变体团簇的变体之间相互满足60°/ 取向关系;随着炉冷后保温温度的降低,α相的相对含量增加,合金的硬度增大,且硬度和α相的相对含量存在一定的线性关系。

 

关键词: 取向关系;形核机制;自协作机制;EBSD

Microstructure evolution of β-ZrTiAlV alloy during furnace cooling
LI Fei-tao1, LUAN Bai-feng1, LIAO Zhong-ni1, ZHANG Xin-yu2, LIU Ri-ping2, LIU Qing1

1. International Joint Laboratory for Light Alloys, Ministry of Education, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

Abstract:The nucleation mechanism of three kinds of α phase (αGB, αWGB and αWI) in furnace-cooling β-51.1Zr40.2Ti4.5Al4.2V alloy and the effect of the relative volume fraction of α and β phases on mechanical properties were investigated systematically by EBSD and XRD. The results show that the αGB with {0001} pole parallel to the common {110} pole of adjacent β grains will present preferred nucleation at β grain boundary. The major nucleation mechanism of αWGB is interface instability nucleation, therefore, αWGB grains nucleate and grow into the interior of prior β grains by inheriting the orientation of αGB. In order to coordinate the strain energy formed during the β→α transformation, αWI develops three-variant cluster by so-called self-accommodation mechanism, the three variants are related to each other by an angle/axis pair 60°/ . With the decrease of furnace-cooling temperature, the relative volume fraction of α phase increases, resulting in the increasement of hardness. There is a linear relationship between hardness and the relative volume fraction of α phase.

 

Key words: orientation relationship; nucleation mechanism; self-accommodation; EBSD

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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