变形量对半固态CuSn10合金组织和性能的影响  

Effects of Deformation on the Microstructure and Properties of Semi-solid CuSn10 Alloys

作　　者：文科 李永坤[1,2] 周荣锋 殷新华[1] 熊文韬 刘程祥 张亚真 Wen Ke;Li Yongkun;Zhou Rongfeng;Yin Xinhua;Xiong Wentao;Liu Chengxiang;Zhang Yazhen(Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;City College,Kunming University of Science and Technology,Kunming 650051,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]昆明理工大学城市学院,云南昆明650051

出　　处：《稀有金属材料与工程》2024年第2期424-434,共11页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51765026)。

摘　　要：材料的组织形态直接影响零件的性能,采用自主研发的熔体约束诱导形核半固态制浆装置制备Cu Sn10半固态浆料并流变挤压成薄板,然后在350℃下轧制变形,研究变形量对微观组织和性能的影响。结果表明,随着变形量增加,变形板件内部缩松缩孔等铸造缺陷逐渐减少减小、晶粒呈现压缩拉长趋势、平均晶粒厚度从初始未变形时30.58μm到变形量ε=0.4时的22.12μm。随变形量的加大在初生相内部产生的形变孪晶数量逐渐增加。在变形量从ε=0增加到ε=0.4的过程中,Cu Sn10合金组织内小角度晶界占比逐渐占优,引入了大量的亚结构和位错密度。在变形量ε=0.4时,可以发现极图{110}和{111}存在[101]、[111]和[001]织构。在板材力学性能方面,板材的屈服强度、抗拉强度和硬度不断增加;但塑性呈现下降的趋势。变形量ε=0.4时,其屈服强度、抗拉强度和布氏硬度(HBW)分别达到了443 MPa、554MPa、1901.2MPa,相较于初始未变形薄板其屈服强度、抗拉强度和硬度分别提高了106.1%、66.4%、41.6%,延伸率降低至0.82%。半固态Cu Sn10合金在变形过程中随变形量的增加强度、硬度不断提高、塑性持续降低,这主要是归功于在轧制变形过程中产生的晶粒细化和加工强化。The effect of deformation on the microstructure and properties of semi-solid CuSn10 alloy was investigated.Semi-solid CuSn10 slurry was made by a self-developed enclosed cooling slope channel(ECSC)and cast into thin plates by rheological squeeze,and then rolled at 350°C.The results show that as deformation increases,casting defects such as shrinkage porosity and shrinkage cavities gradually decrease,with grains compressed and elongated,and their average thickness is reduced from 30.58μm(undeformed)to 22.12μm(ε=0.4).In addition,more deformation twins are found inside the primary phase with increasing deformation.As deformation increases from 0 to 0.4,a large amount of substructures and dislocation density are introduced into the CuSn10 alloy microstructure.Atε=0.4,textures[101],[111],and[001]are found in pole figures{110}and{111}.The mechanical properties of the plate increase,including yield strength,tensile strength,and hardness.At the deformation of 0.4,the yield strength,tensile strength and hardness reach 443 MPa,554 MPa,and 1901.2 MPa,increased by 106.1%,66.4%,and 41.6%,compared with those without deformation,respectively.But the plasticity of the plate is declined,and its elongation decreases to 0.82%.The changes in the alloy are mainly attributed to work hardening and refined grains produced during the rolling deformation.

关 键 词：铜锡合金 半固态 轧制变形 微观结构 EBSD 

分 类 号：TG146.11[一般工业技术—材料科学与工程]