Effects of Zr on the Microstructure and Mechanical Properties of Al-Ni-Co Alloys by Super-gravity Field Solidification

Hu Zhikui; Gan Zhanghua; Wu Chuandong; Lu Yuehui; Shen Shuai

doi:10.15980/j.tzzz.2022.11.019

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Effects of Zr on the Microstructure and Mechanical Properties of Al-Ni-Co Alloys by Super-gravity Field Solidification
Vol. 42, Issue 11, Pages: 1407-1414(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.11.019

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Hu Zhikui, Gan Zhanghua, Wu Chuandong, et al. Effects of Zr on the Microstructure and Mechanical Properties of Al-Ni-Co Alloys by Super-gravity Field Solidification. [J]. Special Casting & Nonferrous Alloys 42(11):1407-1414(2022)
DOI：

Hu Zhikui, Gan Zhanghua, Wu Chuandong, et al. Effects of Zr on the Microstructure and Mechanical Properties of Al-Ni-Co Alloys by Super-gravity Field Solidification. [J]. Special Casting & Nonferrous Alloys 42(11):1407-1414(2022) DOI： 10.15980/j.tzzz.2022.11.019.

摘要

采用超重力场凝固技术制备了不同Zr含量的Al-2.5Ni-0.1Co合金，研究了Zr含量对铸态和直接时效态合金显微组织和高温力学性能的影响。结果表明，Zr固溶于α-Al中并细化了合金的共晶团结构，其固溶效果和细化效果提升了铸态合金的显微硬度。当Zr含量为0.1%时，合金硬度(HV)达到峰值，约为65

Zr含量超过0.3%后，会形成富Zr相。直接时效后，Al-Ni-Co-Zr合金中析出二次Al

Zr相，改善了合金硬度和高温力学性能，Zr含量为0.3%时，合金硬度(HV)最高约为87

300℃下抗拉强度、屈服强度和伸长率分别达到93.2 MPa、62.5 MPa和25.4%。

Abstract

Al-2.5 Ni-0.1 Co alloys with different Zr contents were prepared by super-gravity field solidification technology

and the effects of Zr contents on the microstructure and high-temperature mechanical properties of as-cast and direct aged alloys were investigated. The results indicate that Zr is dissolved in α-Al and refines the eutectic colony structure of the alloys

and the microhardness of the as-cast alloys is increased by the effect of solid solution and refinement. With Zr content of 0.1%

the hardness of the alloy reaches a peak of about 65 HV

and the Zr-rich phase is formed when Zr content is over 0.3%. After direct aging

the secondary Al

Zr phase is precipitated in the Al-Ni-Co-Zr alloy

improving the hardness and high-temperature mechanical properties of the alloy. When Zr content is 0.3%

the hardness of the alloy reaches up to about 87 HV

where the high-temperature tensile strength

yield strength and elongation of the Al-Ni-Co alloy at 300 ℃ reach 93.2 MPa

62.5 MPa and 25.4%

respectively.