Effects of Al-Ti-B Refiners on Microstructure and Properties of Semi-continuous Casting 7050 Aluminum alloy

Chao Daiyi; Huang Tongjian; He Wei; Sun Youzheng; Yu Fang; Wang Zhixiong; Lü Zhengfeng

doi:10.15980/j.tzzz.2020.11.017

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Effects of Al-Ti-B Refiners on Microstructure and Properties of Semi-continuous Casting 7050 Aluminum alloy
Vol. 40, Issue 11, Pages: 1256-1259(2020)
Published： 2020 ，
DOI： 10.15980/j.tzzz.2020.11.017

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[1]晁代义,黄同瑊,赫微,孙有政,于芳,王志雄,吕正风.Al-Ti-B细化剂对半连续铸造7050铝合金组织及性能的影响[J].特种铸造及有色合金,2020,40(11):1256-1259.

Chao Daiyi, Huang Tongjian, He Wei, et al. Effects of Al-Ti-B Refiners on Microstructure and Properties of Semi-continuous Casting 7050 Aluminum alloy. [J]. Special Casting & Nonferrous Alloys 40(11):1256-1259(2020)
[1]晁代义,黄同瑊,赫微,孙有政,于芳,王志雄,吕正风.Al-Ti-B细化剂对半连续铸造7050铝合金组织及性能的影响[J].特种铸造及有色合金,2020,40(11):1256-1259. DOI： 10.15980/j.tzzz.2020.11.017.

Chao Daiyi, Huang Tongjian, He Wei, et al. Effects of Al-Ti-B Refiners on Microstructure and Properties of Semi-continuous Casting 7050 Aluminum alloy. [J]. Special Casting & Nonferrous Alloys 40(11):1256-1259(2020) DOI： 10.15980/j.tzzz.2020.11.017.

摘要

分析了Al-5Ti-0.2B、Al-5Ti-1B和Al-3Ti-1B等3种晶粒细化剂的微观组织差异

研究了3种细化剂对大尺寸7050铝合金晶粒的细化效果及对7050-T7541态厚板性能的影响。结果显示

3种细化剂中TiAl

相主要呈块状分布

尺寸为15～50μm

TiB

相呈小颗粒状

且易偏聚

尺寸为1～2μm。3种细化剂中TiAl

相含量分别为8.16%、5.60%和1.45%

从细化效果来看

Al-5Ti-1B细化效果最佳

铸锭芯部和边部尺寸分别为87μm和60μm。同时

添加Al-5Ti-1B细化剂的7050铝合金厚板的力学性能最佳

抗拉强度、屈服强度及伸长率分别为555 MPa、505 MPa和14.8%。

Abstract

The difference in microstructure of Al-5 Ti-0.2 B

Al-5 Ti-1 B and Al-3 Ti-1 B grain refiners

and the effects of the three refiners on the grain refinement of large-sized 7050 aluminum alloy and the properties of 7050-T7451 state thick plate were investigated. The results reveal that TiAl

phase in three refiners is mainly distributed as a block with a size of 15～50 μm

while TiB

phase is a small particle with a size of 1～2 μm and easy to aggregate irregularly. The TiAl

phase content in the three refiners is 8.16%

5.60% and 1.45%

respectively. The refining effect of Al-5 Ti-1 B refiner is the desirable

with the core size of 87 μm and edge size of 60 μm.Meanwhile

the 7050 alloy thick plate with Al-5 Ti-1 B refiner has the satisfied mechanical properties

and the tensile strength

yield strength and elongation reach up to 555 MPa

505 MPa and 14.8%

respectively.