摘要
采用搅拌摩擦加工(FSP)方法制备Al-Pb表面复合材料,以提高其减摩抗磨性能,使用SEM、EBSD、纳米压痕仪和显微硬度计等分析其微观组织、织构和硬度分布。结果表明:使用FSP方法制备Al-Pb表面复合材料,Pb颗粒受到重力和搅拌作用,主要分布于盆状搅拌加工区的底部。塑性金属对流形成的洋葱环结构中,存在富Pb片层和形变铝基体片层。富Pb片层内的Pb颗粒,起到了良好的细化晶粒作用。形变铝基体片层分布有少量直径约100 nm的新生Pb粒。受到细晶强化作用影响,富Pb颗粒区的硬度显著高于形变铝基体。加工区底部的SZ-AS区形成强Cube再结晶织构;SZ-RS区形成Cube织构和少量Brass织构;CSZ区的Cube织构较少,{111}织构增强;上部的AS区形成强Goss织构,RS区织构相对随机。
Al-Pb surface composites were prepared by friction stir processing(FSP)to improve their friction and wear properties.The microstructure,texture and hardness distribution of Al-Pb surface composites were analyzed by SEM,EBSD,nano indentation and microhardness tester.The results show that the Pb particles are mainly distributed at the bottom of processing area under the action of gravity and agitation.The onion ring structure is formed by the flow of the plastic material.There are Pb-rich lamellae and deformed aluminum matrix lamellae in the onion ring structure.The Pb particles in the Pb-rich lamellae play an important role in grain refinement.Meanwhile,a small amount of new Pb particles(about 100 nm)form in the deformed aluminum matrix.The grain refinement results show that the microhardness of Pb-rich lamellae is significantly higher than that of deformed aluminum matrix.Furthermore,there are different types of texture in the different zones.At the bottom of the processing area,there is a strong Cube texture on SZ-AS.SZ-RS has Cube texture and a small amount of brass texture,and CSZ has weak Cube texture and{111}texture.At the top,there is a strong Goss texture on AS,and the texture on RS is relatively random.
作者
许峰
杨莉
熊义峰
刘坡
张尧成
Xu Feng;Yang Li;Xiong Yifeng;Liu Po;Zhang Yaocheng(School of Automotive Engineering,Changshu Institute of Technology,Changshu 215500,China;School of Mechanical Engineering,Guilin University of Aerospace Technology,Guilin 541004,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2021年第3期957-962,共6页
Rare Metal Materials and Engineering
基金
江苏省高等学校自然科学研究重大项目(18KJA460001)。
