7020铝合金搅拌摩擦焊接接头微观组织和力学性能

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Abstract The microstructure and mechanical properties of friction stir welded 7020-T6 alloy were investigated by micro-hardness test, tensile mechanical properties test, metangraphic microscope, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the hardness distribution appears as the W-shaped profile in alloy weld zone and reaches to minimum in HMAZ/HAZ. The tensile strength, yield strength, elongation and welding coefficient of the welded joint are 352 MPa, 223 MPa, 9.8% and 86.9%, respectively. The grain structure shows significant difference in the welded zone. The fine and dispersive precipitates of CP zone and η° phase formed after artificial aging (90 ℃/8 h+135 ℃/16 h) in base metal are dissolved during the process of friction stir weld and re- precipitate later, but the size and density of precipitates in welded joint are much smaller than base metal.

Key words： 7020 aluminum alloy friction stir weld hardness microstructure mechanical property

Received: 14 April 2017 Published: 12 July 2019

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TG457.14

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	CHEN Xiangrong
	ZHENG Ziqiao

Cite this article:

CHEN Xiangrong,ZHENG Ziqiao. Microstructur and mechanical properties of the friction stir welded joint of 7020 aluminum alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(2): 172-179.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I2/172

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