锻压技术

退火温度对拉拔Cu-14Fe合金微观组织和性能的影响

英文标题：Influence of annealing temperature on microstructure and properties for drawn Cu-14Fe alloy

作者：郭炜谌昀姜江陈威陆德平刘克明徐萌利

分类号：TG166；TG359

出版年,卷(期):页码：2020,45(12):191-194

摘要：

为了研究拉拔制备的Cu-Fe合金的微观组织、探讨退火温度对合金性能的影响规律，对真空熔炼制备的Cu-14Fe合金，采用不同的应变量进行拉拔加工，并在不同温度的退火处理后，采用光学显微镜、电子万能试验机、数字式微欧计研究了合金的微观组织、力学性能和导电性能。结果表明：拉拔变形使合金中的第二相分布由铸态时的随机树枝形态转变为沿拉拔方向的纤维形态，加工应变量越高，纤维形态的第二相越细长，在铜基体中的分布越均匀；拉拔态合金的抗拉强度为618 MPa，伸长率为21%，在200 ℃退火后，抗拉强度和伸长率变化不显著，随着退火温度逐渐升高至550 ℃，合金的抗拉强度逐渐降低至416 MPa，伸长率逐渐提高至199%；随着退火温度逐渐升高，合金的电阻率不断降低。

In order to study the microstructure of Cu-Fe alloy prepared by drawing and explore the influence law of annealing temperature on the properties of alloy, for Cu-14Fe alloy prepared by means of vacuum melting, the drawing process was conducted with different strains，and the microstructure, mechanical properties and conductivity of the alloy were studied by optical microscope, electronic universal testing machine and digital microhmmeter after annealing treatment at different temperatures. The results show that the drawing deformation makes the distribution of the second phase in the alloy to change from random dendritic morphology in as-cast state to the fiber morphology along the drawing direction. The bigger the processing strain is, the longer the second phase with fiber morphology is, and the more uniform the distribution in Cu matrix is. Furthermore, the tensile strength of the as-drawn alloy is 618 MPa, and the elongation is 21%. When the alloy is annealed at 200 ℃, the tensile strength and elongation change insignificantly. However, as the annealing temperature increases to 550 ℃, the tensile strength gradually decreases to 416 MPa, and the elongation increases to 199%. With the increasing of annealing temperature, the resistivity of alloy gradually decreases.

基金项目：

江西省重点研发计划(20202BBEL53026, 20202ZDH02063)；国家自然科学基金资助项目(51861025)；江西省自然科学基金资助项目(20192BAB206001)；江西省科学院重点科研项目(2020-YZD-2, 2017-YZD2-20)

郭炜（1981-），男，博士，副研究员 E-mail：guowei66@sohucom

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