Revealing the Nucleation and Growth Mechanisms of Fe-Rich Phases in Al-Cu-Fe(-Si) Alloys Under the Influence of Al-Ti-B

43 Pages Posted: 8 Sep 2021

See all articles by Yuliang Zhao

Yuliang Zhao

Dongguan University of Technology - Neutron Scattering Technical Engineering Research Center

Dongfu Song

Guangdong Academy of Science - Institute of Materials and Processing

Haoliang Wang

Dongguan University of Technology

Lijia Chen

Dongguan University of Technology

Zhenzhong Sun

Dongguan University of Technology - Neutron Scattering Technical Engineering Research Center

Tongguang Zhai

Dongguan University of Technology

Yanan Fu

Chinese Academy of Sciences (CAS) - Guangdong Academy of Sciences (GDAS)

Yao Wang

Center of Excellence for Advanced Materials (CEAM)

Shuhong Liu

Central South University - State Key Laboratory of Powder Metallurgy

Yong Du

Central South University - State Key Laboratory of Powder Metallurgy

Weiwen Zhang

South China University of Technology - National Engineering Research Centre of Near-net-shape Forming for Metallic Materials

Date Written: 2021

Abstract

Al-5Ti-1B is commonly added to the Al alloys for grain refinement, which also affects the type, size, morphology, and formation sequence of Fe-rich intermetallic phases. The underlying nucleation and growth mechanism of Fe-rich phases under the influence of Al-5Ti-1B during the solidification of Al-Cu-Fe(-Si) alloys were systematically studied by thermodynamic calculation, and with scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), focused ion beam (FIB) coupled with transmission electron microscopy (TEM), and in-situ synchrotron X-ray radiography. The SEM and in-situ synchrotron X-ray radiography experiments revealed that the Al-5Ti-1B addition significantly reduced the size and number of primary Al3(CuFe) phases. and refined the size of α-Fe in Al-Cu-Fe-Si alloy without changing their type. This was caused by Ti solute atoms in Al melts, which limiting the nucleation and growth of primary Al3(CuFe) phases during solidification. The FIB and TEM results showed that the prior formed TiB2 particles or/and newly-formed aluminium oxide were nucleate sites for Al6(CuFe) phase and α-Fe phase in Al-Cu-Fe alloy and Al-Cu-Fe-Si alloy, respectively. The Edge-to-Edge model and orientation relationship further confirmed the experimental results. In addition, V diffusion into TiB2 particles in the Al melts to form (TiV)B2 particles and lowering the interfacial energy enhance the heterogenous nucleation for Fe-rich phases.

Keywords: Al alloys, Synchrotron x-ray, Fe-rich phases, Grain refinement, Nucleation and growth

Suggested Citation

Zhao, Yuliang and Song, Dongfu and WANG, HAOLIANG and Chen, Lijia and Sun, Zhenzhong and Zhai, Tongguang and Fu, Yanan and Wang, Yao and Liu, Shuhong and Du, Yong and Zhang, Weiwen, Revealing the Nucleation and Growth Mechanisms of Fe-Rich Phases in Al-Cu-Fe(-Si) Alloys Under the Influence of Al-Ti-B (2021). Available at SSRN: https://ssrn.com/abstract=3919733 or http://dx.doi.org/10.2139/ssrn.3919733

Yuliang Zhao (Contact Author)

Dongguan University of Technology - Neutron Scattering Technical Engineering Research Center ( email )

Dongguan, 523808
China

Dongfu Song

Guangdong Academy of Science - Institute of Materials and Processing

Guangzhou
China

HAOLIANG WANG

Dongguan University of Technology

Lijia Chen

Dongguan University of Technology

Dongguan, 523808
China

Zhenzhong Sun

Dongguan University of Technology - Neutron Scattering Technical Engineering Research Center

Dongguan, 523808
China

Tongguang Zhai

Dongguan University of Technology

Dongguan, 523808
China

Yanan Fu

Chinese Academy of Sciences (CAS) - Guangdong Academy of Sciences (GDAS)

China

Yao Wang

Center of Excellence for Advanced Materials (CEAM)

China

Shuhong Liu

Central South University - State Key Laboratory of Powder Metallurgy ( email )

Changsha, Hunan 410083
China

Yong Du

Central South University - State Key Laboratory of Powder Metallurgy ( email )

Changsha, Hunan 410083
China

Weiwen Zhang

South China University of Technology - National Engineering Research Centre of Near-net-shape Forming for Metallic Materials ( email )

Guangzhou
China

Do you have a job opening that you would like to promote on SSRN?

Paper statistics

Downloads
37
Abstract Views
164
PlumX Metrics