Influence of Sc and Zr additions on microstructure and properties evolution of Al–Zn–Mg alloy

Jiang, Keda; Zhang, Zhen; Zhu, Wenbo; Pan, Qing‐Jiang; Deng, Yunlai; Guo, Xiaobin

doi:10.1007/s10853-021-06692-6

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…Therefore, Al 3 Zr phases were first precipitated from the melt with Al 3 Sc precipitated after Al 3 Zr during solidification of the as-cast No.5 alloy according to the binary diagram of Al-Zr and Al-Sc system [11] [13] . Because the crystalline lattice parameter of both Al 3 Zr (DO 23 ) and Al 3 Sc (LI 2 ) between α(Al)(LI 2 ) are similar [12] , the Al 3 Zr and Al 3 Sc phases can become the heterogeneous nucleus of α(Al) crystallization [14][15][16] . On the other hand, α(Al) can also become the heterogeneous nucleus of Al 3 Sc phases.…”

Section: Methodsmentioning

confidence: 99%

Study on the Effect of Microstructures and Properties of Al-Mg-Mn-Zr Alloy Welding Wire by Adding Minor Sc

Chen¹,

Yan-ru²,

Chen³

et al. 2023

J. Phys.: Conf. Ser.

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The low strength of welded joints of aluminum alloy welding wire materials has seriously restricted the promotion and application of high-performance aluminum alloys represented by 7A52 and 7B52 aluminum alloy. It is urgent to develop new high-strength aluminum alloy welding wire material to meet the lightweight application demand of 7××× series high-performance aluminum alloy materials in military and civilian vehicles. This paper studied the effect on microstructures, mechanical properties, and welding properties of Al-6Mg-0.3Mn-0.2Zr welding wire alloys by adding minor Sc elements. The result shows that it formed Al3Zr, Al3Sc, and Al3(Sc1-x, Zrx) primary dispersive phases in the matrix, and the Al3(Sc1-x, Zrx) primary phase, which had triple-shell microstructure composed of Al3Zr/α(Al)/Al3Sc three-layer phases enclosing individually with each other from the center to outside. These phases could promote heterogeneous nucleation during solidification and crystallization in the process of welding, resulting in strong refinement and strengthening effects in the weld-zone microstructure. The welding joint mechanical properties of both tensile strength and elongation increased with the increase of Sc contents within the range of 0–0.4%. It was reached at Rm 365 MPa/A 5% without means of heat treatment which are much higher than aluminum alloy welding wires used in current engineering when the 7B52 aluminum alloy laminated plates were welded with the prepared welding wire Al-6Mg-0.3Mn-0.2Zr alloys of 0.385% Sc.

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