Effects of Sc and Zr on Microstructure and Properties of As-cast and Heat-treated State 7055 Aluminum Alloy

Chen Yong; Zhang Jun; Teng Guangbiao; Liu Chongyu; Jiang Hongjie; Zhou Wenbiao

doi:10.15980/j.tzzz.2018.10.023

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Effects of Sc and Zr on Microstructure and Properties of As-cast and Heat-treated State 7055 Aluminum Alloy
Vol. 38, Issue 10, Pages: 1130-1133(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.10.023

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[1]陈勇,张军,滕广标,刘崇宇,江鸿杰,周文标.Sc和Zr对7055合金铸态及热处理态组织和性能的影响[J].特种铸造及有色合金,2018,38(10):1130-1133.

Chen Yong, Zhang Jun, Teng Guangbiao, et al. Effects of Sc and Zr on Microstructure and Properties of As-cast and Heat-treated State 7055 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 38(10):1130-1133(2018)
[1]陈勇,张军,滕广标,刘崇宇,江鸿杰,周文标.Sc和Zr对7055合金铸态及热处理态组织和性能的影响[J].特种铸造及有色合金,2018,38(10):1130-1133. DOI： 10.15980/j.tzzz.2018.10.023.

Chen Yong, Zhang Jun, Teng Guangbiao, et al. Effects of Sc and Zr on Microstructure and Properties of As-cast and Heat-treated State 7055 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 38(10):1130-1133(2018) DOI： 10.15980/j.tzzz.2018.10.023.

摘要

在7055合金成分基础上添加0.14%的Zr及0.15%的Sc

获得7055-0.14Zr-0.15Sc合金。对比该合金与7055合金的铸造、均匀化、轧制及T6态的微观组织与力学性能。研究发现

由Zr、Sc添加所形成的初生Al

（Sc

Zr）相在铸造过程中起到促进非均质形核、细化合金组织的作用。均匀化热处理促使纳米Al

（Sc

Zr）相析出

该相在热变形及固溶时效处理过程中起到钉扎晶界的作用

进而显著地抑制了晶粒粗化。因此

与7055合金相比

7055-0.14Zr-0.15Sc合金具有更高的强度及塑性。

Abstract

0.14% Zr and 0.15%Sc were added in the 7055Al alloy to prepared the 7055-0.14Zr-0.15Sc alloy.The microstructures and mechanical properties of 7055-0.14Zr-0.15Sc and 7055alloys were analyzed comparatively at as-cast

homogenization

rolling and T6treated states.The results reveal that the primary Al

（Sc

Zr）phase can promote the heterogeneous nucleation during casting to refine the microstructure of the 7055-0.14Zr-0.15Sc alloy.The nanosized Al

（Sc

Zr）phase can be precipitated in the7055-0.14Zr-0.15Sc alloy during homogenization treatment

which can pin the grain boundaries during deformation and T6processes

thereby promotes the grain refinement in the 7055-0.14Zr-0.15Sc alloy.Compared with the 7055

the 7055-0.14Zr-0.15Sc alloy presents the higher strength and ductility.