微量<strong>Cu</strong>和形变热处理对<strong>Al-Fe</strong>合金性能的影响

doi:10.11901/1005.3093.2019.249

材料研究学报

2019, Vol. 33

Issue (11): 874-880 DOI: 10.11901/1005.3093.2019.249

研究论文

本期目录 | 过刊浏览

微量Cu和形变热处理对Al-Fe合金性能的影响

王海生¹(

),闵洁¹,王云¹,邓可月²

1. 红河学院机械工程系蒙自 661100
2. 江西博能上饶客车有限公司上饶 334100

Effect of Minor-Cu Addition and Thermomechanical Treatment on Properties of Al-Fe Alloy

WANG Haisheng¹(

),MIN Jie¹,WANG Yun¹,DENG Keyue²

1. Department of Mechanical Engineering, Honghe University, Mengzi 661100, China
2. Jiangxi Boneng Shangrao Bus Co. Ltd. , Shangrao 334100, China

引用本文:

王海生,闵洁,王云,邓可月. 微量Cu和形变热处理对Al-Fe合金性能的影响[J]. 材料研究学报, 2019, 33(11): 874-880.
Haisheng WANG, Jie MIN, Yun WANG, Keyue DENG. Effect of Minor-Cu Addition and Thermomechanical Treatment on Properties of Al-Fe Alloy[J]. Chinese Journal of Materials Research, 2019, 33(11): 874-880.

全文: PDF(4263 KB) HTML

摘要:

观察Al-Fe合金的显微组织并测量其力学性能和导电性能，研究了Cu元素和形变热处理对其性能的影响。结果表明：在铸态Al-Fe-Cu合金组织中，Cu元素在基体内均匀分布，而Fe元素在晶界处偏析；挤压态的Al-0.7Fe-0.2Cu合金其性能最优：导电率为59.90%IACS，抗拉强度为108 MPa，硬度为31.2HV；随着退火温度的提高Al-0.7Fe-0.2Cu合金的抗拉强度急剧降低，在400℃退火时其抗拉强度最低(100 MPa)，伸长率最高(31.3%)；在250℃退火时导电率出现峰值(62.61%IACS)。在退火Al-0.7Cu-0.2Cu合金中有许多细小针状的θ(Al₂Cu)相析出，并与位错交互缠结。随着退火温度的提高合金中的位错密度降低，晶粒细化。

关键词 ： Al-Fe-Cu合金, 抗拉强度, 导电率, 伸长率, θ(Al₂Cu)析出相

Abstract：

The effect of minor-Cu addition and thermomechanical treatment on the microstructure and properties of Al-Fe alloy was investigated by means of optical microscopy, SEM, tensile test, and conductivity measurement. The results show that Cu was evenly distributed in the matrix of as-cast Al-Fe-Cu alloy, while the Fe segregated at grain boundary. After extrusion the properties of Al-0.7Fe-0.2Cu alloy reached the optimum, the conductivity was 59.90% IACS, the tensile strength was 108 MPa, and the hardness was 31.2HV. The tensile strength of Al-0.7Fe-0.2Cu alloy decreased sharply with the increase of annealing temperature. The tensile strength was the lowest (100 MPa) after annealing at 400℃, while the elongation was the highest (31.3%). The peak electrical conductivity of Al-0.7Fe-0.2Cu alloy was 62.61% IACS after annealing at 250℃. In addition, many fine needle-like θ(Al₂Cu) phase precipitated during annealing in Al-0.7Cu-0.2Cu alloy, which interacted with dislocations. With the increase of annealing temperature, dislocation density decreased and grain refinement occurred.

Key words： Al-Fe-Cu alloy tensile strength electrical conductivity elongation θ (Al₂Cu) precipitate

收稿日期: 2019-05-13

ZTFLH:

TG162.83

基金资助:云南省高校联合青年项目(2017FH001-119);云南省应用基础研究计划(2018FD089)

作者简介: 王海生，男，1979年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.249 或 https://www.cjmr.org/CN/Y2019/V33/I11/874

表1 Al-Fe合金的化学成分

图1 铸态Al-Fe-Cu合金的金相形貌

图2 铸态A号合金的扫描形貌和元素的面分布

图3 铸态A合金的SEM形貌

表2 图3中不同区域的化学成分

图4 Al-Fe-Cu合金铸态的DSC曲线

图5 Al-Fe-Cu合金均匀化态的显微组织

表3 挤压态Al-Fe-Cu合金的性能

图6 合金挤压态的TEM形貌

图7 在不同温度退火后冷拉态A合金的电导率

图8 在不同温度退火后冷拉态A合金的抗拉强度和伸长率

图9 在不同温度退火后A合金的TEM照片

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