Yb微合金化Al-2.4Cu-1.3Li合金的均匀化退火工艺及微观组织演变

doi:10.13251/j.issn.0254-6051.2023.02.020

金属热处理 ›› 2023, Vol. 48 ›› Issue (2): 131-137.DOI: 10.13251/j.issn.0254-6051.2023.02.020

Yb微合金化Al-2.4Cu-1.3Li合金的均匀化退火工艺及微观组织演变

郑直, 高坤元, 文胜平, 黄晖, 吴晓蓝, 魏午, 聂祚仁

北京工业大学材料与制造学部教育部先进功能材料重点实验室,北京 100124

收稿日期:2022-09-02 修回日期:2022-12-13 出版日期:2023-02-25 发布日期:2023-03-22
通讯作者: 高坤元,教授,博士,E-mail: gaokunyuan@bjut.edu.cn
作者简介:郑直(1995—),男,硕士研究生,主要研究方向为铝合金,E-mail:532935385@qq.com。
基金资助:
国家重点研发计划(2021YFB3704201, 2021YFB3704205);北京市自然科学基金(2202009)

Homogenization treatment and microstructure evolution of Al-2.4Cu-1.3Li alloy micro-alloyed with Yb

Zheng Zhi, Gao Kunyuan, Wen Shengping, Huang Hui, Wu Xiaolan, Wei Wu, Nie Zuoren

Key Laboratory of Advanced Functional Materials, Education Ministry of China,Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

Received:2022-09-02 Revised:2022-12-13 Online:2023-02-25 Published:2023-03-22

摘要/Abstract

摘要： 通过SEM、EDS、DSC、XRD等测试手段研究了Al-2.4Cu-1.3Li-(Yb)合金铸态及均匀化过程中组织及微观结构演变。SEM观察显示,铸态组织中存在明显的枝晶偏析,枝晶间距为45±6 μm(Al-Cu-Li合金)与43±7 μm(Al-Cu-Li-Yb合金),一次相形貌为块状或条状,面积占比为2.8%(Al-Cu-Li合金)与2.2%(Al-Cu-Li-Yb合金),EDS和XRD结果显示其主要成分为多种AlCu(Li)相,Al-Cu-Li-Yb合金中还存在少量Al₈Cu₄Yb相。根据DSC测试与均匀化动力学计算,制定均匀化退火工艺为500 ℃×12 h。SEM观察显示退火后样品枝晶偏析已经消除,残留一次相为聚集球状AlCuFe相和/或骨骼状Al₈Cu₄Yb相,面积占比下降到0.93% (Al-Cu-Li合金)和0.76%(Al-Cu-Li-Yb合金)。为了使Yb进一步回溶,针对Al-Cu-Li-Yb合金制定二级均匀化工艺为500 ℃×12 h+530 ℃×12 h,残留一次相面积占比下降到0.53%,形貌与一级均匀化后相同。

关键词: Al-Cu-Li合金, Yb微合金化, 均匀化, 微观组织

Abstract: Microstructure evolution of the Al-2.4Cu-1.3Li-(Yb) alloys during homogenization was analyzed by means of SEM, EDS, DSC and XRD measurements. The SEM observations show obvious dendrite in the as-cast alloys with the average dendrite spacing of 45±6 μm(Al-Cu-Li alloy) and 43±7 μm(Al-Cu-Li-Yb alloy), respectively. The morphology of primary phase is block or strip-like with 2.8% (Al-Cu-Li alloy) and 2.2% (Al-Cu-Li-Yb alloy) in relative ratio of area in SEM images. EDS and XRD results show that primary phases include mainly several types of Al-Cu-(Li) phases and Al₈Cu₄Yb phase additionally in case of the Al-Cu-Li-Yb alloy. Based on the DSC and homogenization kinetic analysis, the homogenization treatment is determined to be 500 ℃×12 h for remove the dendrite segregation. The corresponding SEM images of the specimens after homogenization treatment demonstrate that the retained phases are gathered tiny spheres of AlCuFe phases and/or skeletal-like Al₈Cu₄Yb phase, with the area fraction decreasing to 0.93% (Al-Cu-Li alloy) and 0.76% (Al-Cu-Li-Yb alloy), respectively. In order to dissolve more Yb to the matrix, a two-step homogenization treatment for the Al-Cu-Li-Yb alloy is determined experimentally to be 500 ℃×12 h+530 ℃×12 h. The SEM analysis showes the relative ratio of area of retained phases reduces to 0.53%. The morphology is the same as that of one-step homogenization annealing.

Key words: Al-Cu-Li alloy, Yb microalloying, homogenization, microstructure

中图分类号:

TG166.3

郑直, 高坤元, 文胜平, 黄晖, 吴晓蓝, 魏午, 聂祚仁. Yb微合金化Al-2.4Cu-1.3Li合金的均匀化退火工艺及微观组织演变[J]. 金属热处理, 2023, 48(2): 131-137.

Zheng Zhi, Gao Kunyuan, Wen Shengping, Huang Hui, Wu Xiaolan, Wei Wu, Nie Zuoren. Homogenization treatment and microstructure evolution of Al-2.4Cu-1.3Li alloy micro-alloyed with Yb[J]. Heat Treatment of Metals, 2023, 48(2): 131-137.

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Yb微合金化Al-2.4Cu-1.3Li合金的均匀化退火工艺及微观组织演变

Homogenization treatment and microstructure evolution of Al-2.4Cu-1.3Li alloy micro-alloyed with Yb

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