Towards Improved Plasticity in Cold-Sprayed Amorphous/Nanocrystalline Aluminum Alloy Deposits: The Role of Heat Treatment on the Microstructure and Mechanical Anisotropy

被引：0

作者：

John, Denny ^{[1
]}

Mohammed, Sohail M. A. K. ^{[1
]}

Fu, Yiei ^{[2
]}

Lama, Anil ^{[1
]}

Paul, Tanaji ^{[1
]}

Seal, Sudipta ^{[2
]}

Agarwal, Arvind ^{[1
]}

机构：

[1] Florida Int Univ, Dept Mech & Mat Engn, Cold Spray & Rapid Deposit Lab ColRAD, 10555 West Flagler St, Miami, FL 33174 USA

[2] Univ Cent Florida, Adv Mat Proc & Anal Ctr, Dept Mat Sci & Engn, Orlando, FL USA

来源：

JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2025年

关键词：

amorphous alloys; anisotropy; crack propagation; high-speed imaging; <italic>in situ</italic> tensile testing; residual stress; COATINGS; BEHAVIOR;

D O I：

10.1007/s11666-025-01968-8

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Amorphous/nanocrystalline aluminum alloys (Al-Ni-Y-Co-Sc) have potential for high-strength cold spray deposits, but their limited plasticity restricts thick deposit formation. This study explores a composite deposit using a 1:1 weight ratio of Al-Ni-Y-Co-Sc and Al-6061, focusing on microstructural tailoring through heat treatment at 320 and 380 degrees C. Heat treatment induced crystallization in Al-Ni-Y-Co-Sc splats, forming Al3Ni and Al3Sc precipitates, while Al-6061 regions showed grain growth and dislocation recovery. This resulted in a bimodal elastic modulus distribution, with Al-Ni-Y-Co-Sc regions exhibiting higher stiffness (80-110 GPa) compared to Al-6061 (65-75 GPa), while fine grains and precipitates in the microstructure yielded a microhardness of 261 HV, which decreased by 33 and 40% at 320 and 380 degrees C, respectively. Anisotropy in mechanical behavior, assessed by indentation techniques, reduced with heat treatment due to stress relaxation and grain growth. The ultimate tensile strength decreased from 298 to 260 MPa, with ductility increasing slightly from 0.3 to 0.5%. Although failure occurred through crack propagation in brittle Al-Ni-Y-Co-Sc splats, the crack propagation rate decreased from 61 to 16 ms-1 after heat treatment, indicating improved crack resistance. Further optimization of the Al-Ni-Y-Co-Sc/6061 ratio and heat treatment is recommended to mitigate brittle failure in these deposits.

引用

页码：1418 / 1435

页数：18

共 41 条

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