Additively Manufactured Al-Mg-Ca-Sc Alloy with Hierarchical Microstructure: Strong and Ductile at Both Room and Elevated Temperatures

44 Pages Posted: 13 Nov 2024

See all articles by Shasha Zhang

Shasha Zhang

Nanjing University of Aeronautics and Astronautics

Shuaipeng Yu

Nanjing University of Aeronautics and Astronautics

Peiheng Ding

Nanjing University of Aeronautics and Astronautics

Haiquan Du

Nanjing University of Aeronautics and Astronautics

Man Long

Nanjing University of Aeronautics and Astronautics

Zhengjun Yao

Nanjing University of Aeronautics and Astronautics - College of Materials Science and Technology

Zili Liu

Nanjing University of Aeronautics and Astronautics

Xiebin Wang

Shandong University

Xiang-Shan Kong

Shandong University - Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials

Lei Cheng

University of Science and Technology Beijing

Nikolay Belov

National University of Sciences and Technology (NUST)

Torgom Akopyan

National University of Sciences and Technology (NUST)

Stefan Pogatscher

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys

Quancheng Zhang

affiliation not provided to SSRN

Linfei Shuai

Chongqing University

Tianlin Huang

Chongqing University - International Joint Laboratory for Light Alloys (MOE)

Abstract

An Al-Mg-Ca-Sc alloy with low hot cracking susceptibility was designed and fabricated by selective laser melting technology. A hierarchical microstructure, i.e., solute Mg, dispersed nanoscale Al3(Sc, Zr) precipitates in the grains and a semi-network of Al4Ca eutectic phases along grain boundaries, was built. The mechanical properties of the additively manufactured alloy showed superior strength and ductility at room temperature compared with the cast alloy arisen from the fine microstructure and a high fraction of the strength was retained at elevated temperatures due to the high thermal stability of nano-precipitates and grain boundaries when compared with the additively manufactured AlSi10Mg and Scalmalloy® alloys and the cast Al-Mg-Ca-Sc alloy. An analysis of strengthening mechanisms revealed that the grain boundary strengthening contributes most to the yield strength, followed by particle strengthening and solid solution strengthening. Ab initio calculations revealed a strong grain boundary segregation tendency for Ca, whereas the segregation tendency was weak for other elements, unraveling the origin of the hierarchical microstructure. Moreover, the evaluation of embrittlement potency showed that the segregation of Ca at grain boundaries does not cause grain boundary embrittlement, consistent with the measured high ductility.

Keywords: Additive Manufacturing, Aluminum alloys, Hierarchical microstructure, Mechanical properties, Ab initio calculations

Suggested Citation

Zhang, Shasha and Yu, Shuaipeng and Ding, Peiheng and Du, Haiquan and Long, Man and Yao, Zhengjun and Liu, Zili and Wang, Xiebin and Kong, Xiang-Shan and Cheng, Lei and Belov, Nikolay and Akopyan, Torgom and Pogatscher, Stefan and Zhang, Quancheng and Shuai, Linfei and Huang, Tianlin, Additively Manufactured Al-Mg-Ca-Sc Alloy with Hierarchical Microstructure: Strong and Ductile at Both Room and Elevated Temperatures. Available at SSRN: https://ssrn.com/abstract=5020088 or http://dx.doi.org/10.2139/ssrn.5020088

Shasha Zhang (Contact Author)

Nanjing University of Aeronautics and Astronautics ( email )

Yudao Street
210016
Nanjing,, 210016
China

Shuaipeng Yu

Nanjing University of Aeronautics and Astronautics ( email )

Yudao Street
210016
Nanjing,, 210016
China

Peiheng Ding

Nanjing University of Aeronautics and Astronautics ( email )

Yudao Street
210016
Nanjing,, 210016
China

Haiquan Du

Nanjing University of Aeronautics and Astronautics ( email )

Man Long

Nanjing University of Aeronautics and Astronautics ( email )

Yudao Street
210016
Nanjing,, 210016
China

Zhengjun Yao

Nanjing University of Aeronautics and Astronautics - College of Materials Science and Technology ( email )

China

Zili Liu

Nanjing University of Aeronautics and Astronautics ( email )

Yudao Street
210016
Nanjing,, 210016
China

Xiebin Wang

Shandong University ( email )

27 Shanda Nanlu
South Rd.
Jinan, SD 250100
China

Xiang-Shan Kong

Shandong University - Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials ( email )

Lei Cheng

University of Science and Technology Beijing ( email )

30 Xueyuan Road, Haidian District
beijing, 100083
China

Nikolay Belov

National University of Sciences and Technology (NUST) ( email )

Sector H-12
Islamabad, 44000
Pakistan

Torgom Akopyan

National University of Sciences and Technology (NUST) ( email )

Sector H-12
Islamabad, 44000
Pakistan

Stefan Pogatscher

Montanuniversität Leoben - Christian Doppler Laboratory for Advanced Aluminum Alloys ( email )

Quancheng Zhang

affiliation not provided to SSRN ( email )

No Address Available

Linfei Shuai

Chongqing University ( email )

Shazheng Str 174, Shapingba District
Shazheng street, Shapingba district
Chongqing 400044, 400030
China

Tianlin Huang

Chongqing University - International Joint Laboratory for Light Alloys (MOE) ( email )

China

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