铝/铜层状复合板真空电子束焊接行为

doi:10.7527/S1000-6893.2023.28288

Abstract

Abstract:

Aluminum/copper （Al/Cu） bimetallic composite plate has the advantages of both aluminum alloy and copper alloy， and has a wide application prospect in aerospace and other fields. In this paper， vacuum electron beam welding （EBW） method was used to weld Al/Cu bimetallic composite plate （Al layer on top and Cu layer on bottom）， and the influence of different welding parameters on the formability， microstructure and mechanical properties of welded joints was studied. The experimental results show that the weld of Al layer is mainly composed of α-Al and Al-Cu eutectic structure， the weld center of Cu layer is composed of Al₂Cu and AlCu intermetallic compounds， and the edge is composed of Al₄Cu₉， AlCu， and Al₂Cu intermetallic compounds. The microhardness of the base material → heat affected zone → weld at the Al/Cu interface layer increases gradually， and the maximum hardness is 578.1 HV. The maximum hardness is 590.4 HV at the vertical interface. The nanoindentation show that the indentation recovery rates in the upper part of the weld， the interface area and the lower part of the weld are 6.31%， 10.88% and 7.84%， respectively， and the center of the weld has higher elastic modulus and hardness. The maximum tensile strength of the welded joint is 64.38 MPa， 36% of the strength of the base metal， and the elongation is 1.44%. The Al layer of the welded joint shows quasi-cleavage fracture， while the Cu layer shows intergranular fracture， which occurs in the region of Al-Cu eutectic structure and Al₂Cu intermetallic compound.

Key words: electron beam welding, Al/Cu bimetallic composite plate, phase composition, nanoindentation, microhardness, mechanism of fracture

CLC Number:

V252

Huiliang GAO, Hongsheng CHEN, Wenxian WANG, Fei CHAI, Zhuoran WANG, Guoting LIU, Pengfei GONG. Vacuum electron beam welding behavior of Al/Cu bimetallic composite plate[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(19): 428288.

Figures/Tables 18

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铝（ AA1060）	铝	铜	硅	铁	锰	镁	锌	钛
占比/wt%	其余	0.05	0.25	0.35	0.03	0.03	0.05	0.03
铜（T2）	铜	磷	镍	硅	铁	锌	硫	银
占比/wt%	其余	0.07	0.02	0.04	0.08	0.09	0.09	0.1

点	铝/at%	铜/at%	物相分析
1	98.19	1.81	α-Al
2	95.41	4.59	α-Al
3	71.39	28.61	Al-Cu共晶
4	96.24	3.76	α-Al
5	83.87	16.13	Al-Cu共晶
6	69.77	30.23	Al₂Cu
7	67.73	32.27	Al₂Cu
8	54.97	45.03	AlCu
9	23.60	76.40	Al₄Cu₉
10	42.41	57.59	AlCu
11	63.53	36.47	Al₂Cu

区域	母材			热影响区				熔合区
区域	铝	铝/铜界面	铜	铝	铝/铜界面		铜	铝	铝/铜界面	铜
硬度/GPa	0.44	0.51	0.52	0.83	0.91	0.88		1.00	1.25	1.10
弹性模量/GPa	67.12	83.38	86.85	133.85	130.52	138.69		145.01	132.77	134.29
压入总功/（10^-9J）	29 272	34 469	35 228	26 802	26 776	26 398		25 052	20 033	22 040
卸载功/（10^-9J）	2 359	1 882	1 984	1 595	1 650	1 588		1 580	2 020	1 729
压痕回复率/%	8.06	5.46	5.63	5.95	6.16	6.02		6.31	10.08	7.84

点	铝/at%	铜/at%	物相分析
1	81.87	18.13	Al-Cu共晶
2	82.91	17.09	Al-Cu共晶
3	81.84	18.16	Al-Cu共晶
4	61.22	38.78	Al₂Cu
5	59.84	40.16	Al₂Cu
6	66.54	33.46	Al₂Cu

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Vacuum electron beam welding behavior of Al/Cu bimetallic composite plate

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