Improvement of Joint Strength of TC4/AZ91D Bimetal in Solid-liquid Compound Casting Process Using Cu-Ni Composite Interlayer

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-08-02 DOI:10.1007/s12540-024-01748-z

Fulin Wen, Dengzhi Zheng, Jianhui Liu

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Abstract

In the present study, the liquid-solid compound casting process has been developed for fabricating AZ91D/TC4 bimetal by adapting a Ni/Cu or Cu/Ni composite intermediate. The effects of interlayer sequence (Ni/Cu and Cu/Ni) on interface microstructure evolution and mechanical properties were investigated in detail. In particular, in order to promote inter-diffusion of Cu and Ti elements at the Cu/Ti interface or Ni and Ti elements at the Ni/Ti interface, the vacuum heat-treat method was adapted before the liquid-solid compound casting process. The results showed that both the Ni/Cu and Cu/Ni composite interlayer realized metallurgical bonding between TC4 and AZ91D. The interface reaction layers of the TC4/AZ91D bimetal using Cu/Ni composite interlayer were composed of Mg₂(Ni, Cu), Ni₂Mg₃Al, Cu(Ni) solid solution and Mg-Ni eutectic structure. However, the interface reaction layers of TC4/AZ91D bimetal using the Ni/Cu composite interlayer were mainly composed of Mg₂(Ni, Cu), (Al₃Ni + Ni₂Mg₃Al) and Ni-Ti phases. Nano-indentation tests show that Ni-Ti intermetallic compounds has the highest nano-hardness at interface region, which leading to a poor shear strength at interface. When using Cu/Ni composite interlayer, the TC4/AZ91D bimetal had the highest shear strength of 97 MPa.

Graphical Abstract

Abstract Image

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使用铜镍复合中间膜提高 TC4/AZ91D 双金属在固液复合铸造工艺中的接合强度

在本研究中，通过采用镍/铜或铜/镍复合中间层，开发了用于制造 AZ91D/TC4 双金属的液固复合铸造工艺。详细研究了层间序列（Ni/Cu 和 Cu/Ni）对界面微观结构演变和机械性能的影响。特别是，为了促进 Cu/Ti 界面上 Cu 和 Ti 元素或 Ni/Ti 界面上 Ni 和 Ti 元素的相互扩散，在液固复合铸造工艺之前采用了真空热处理方法。结果表明，Ni/Cu 和 Cu/Ni 复合夹层实现了 TC4 和 AZ91D 的冶金结合。使用铜/镍复合中间膜的 TC4/AZ91D 双金属界面反应层由 Mg2(Ni，Cu)、Ni2Mg3Al、Cu(Ni)固溶体和 Mg-Ni 共晶结构组成。然而，使用 Ni/Cu 复合中间膜的 TC4/AZ91D 双金属的界面反应层主要由 Mg2（Ni，Cu）、（Al3Ni + Ni2Mg3Al）和 Ni-Ti 相组成。纳米压痕测试表明，Ni-Ti 金属间化合物在界面区域的纳米硬度最高，导致界面剪切强度较差。当使用铜/镍复合夹层时，TC4/AZ91D 双金属的剪切强度最高，达到 97 兆帕。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.