Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys
This paper mainly investigated the effect of the Mn/Ag ratio on the microstructure and room temperature and high-temperature (350 °C) tensile mechanical properties of the as-cast and heat-treated Al-6Cu-xMn-yAg (x + y = 0.8, wt.%) alloys. The as-cast alloy has α-Al, Al<sub>2</sub>Cu, and...
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MDPI AG
2024-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/17/6/1371 |
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| author | Xiangzhou Fu Hailong Yang Hanzhang Wang Chifu Huang Yongbin Chen Qiangang Huang Anmin Li Liwen Pan |
| author_facet | Xiangzhou Fu Hailong Yang Hanzhang Wang Chifu Huang Yongbin Chen Qiangang Huang Anmin Li Liwen Pan |
| author_sort | Xiangzhou Fu |
| collection | DOAJ |
| description | This paper mainly investigated the effect of the Mn/Ag ratio on the microstructure and room temperature and high-temperature (350 °C) tensile mechanical properties of the as-cast and heat-treated Al-6Cu-xMn-yAg (x + y = 0.8, wt.%) alloys. The as-cast alloy has α-Al, Al<sub>2</sub>Cu, and a small amount of Al<sub>7</sub>Cu<sub>2</sub> (Fe, Mn) and Al<sub>20</sub>Cu<sub>2</sub> (Mn, Fe)<sub>3</sub> phases. After T6 heat treatment, a massive dispersive and fine θ′-Al<sub>2</sub>Cu phase (100~400 nm) is precipitated from the matrix. The Mn/Ag ratio influences the quantity and size of the precipitates; when the Mn/Ag ratio is 1:1, the θ′-Al<sub>2</sub>Cu precipitation quantity reaches the highest and smallest. Compared with the as-cast alloy, the tensile strength of the heat-treated alloy at room temperature and high temperature is greatly improved. The strengthening effect of the alloy is mainly attributed to the nanoparticles precipitated from the matrix. The Mn/Ag ratio also affects the high-temperature tensile mechanical properties of the alloy. The high-temperature tensile strength of the alloy with a 1:1 Mn/Ag ratio is the highest, reaching 135.89 MPa, 42.95% higher than that of the as-cast alloy. The analysis shows that a synergistic effect between Mn and Ag elements can promote the precipitation and refinement of the θ′-Al<sub>2</sub>Cu phase, and there is an optimal ratio (1:1) that obtains the lowest interfacial energy for co-segregation of Mn and Ag at the θ′/Al interface that makes θ′-Al<sub>2</sub>Cu have the best resistance to coarsening. |
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| id | doaj.art-ac7fa3d3ff954c5096455c63119a6b17 |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-24T18:03:29Z |
| publishDate | 2024-03-01 |
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| series | Materials |
| spelling | doaj.art-ac7fa3d3ff954c5096455c63119a6b172024-03-27T13:52:39ZengMDPI AGMaterials1996-19442024-03-01176137110.3390/ma17061371Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu AlloysXiangzhou Fu0Hailong Yang1Hanzhang Wang2Chifu Huang3Yongbin Chen4Qiangang Huang5Anmin Li6Liwen Pan7School of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaThis paper mainly investigated the effect of the Mn/Ag ratio on the microstructure and room temperature and high-temperature (350 °C) tensile mechanical properties of the as-cast and heat-treated Al-6Cu-xMn-yAg (x + y = 0.8, wt.%) alloys. The as-cast alloy has α-Al, Al<sub>2</sub>Cu, and a small amount of Al<sub>7</sub>Cu<sub>2</sub> (Fe, Mn) and Al<sub>20</sub>Cu<sub>2</sub> (Mn, Fe)<sub>3</sub> phases. After T6 heat treatment, a massive dispersive and fine θ′-Al<sub>2</sub>Cu phase (100~400 nm) is precipitated from the matrix. The Mn/Ag ratio influences the quantity and size of the precipitates; when the Mn/Ag ratio is 1:1, the θ′-Al<sub>2</sub>Cu precipitation quantity reaches the highest and smallest. Compared with the as-cast alloy, the tensile strength of the heat-treated alloy at room temperature and high temperature is greatly improved. The strengthening effect of the alloy is mainly attributed to the nanoparticles precipitated from the matrix. The Mn/Ag ratio also affects the high-temperature tensile mechanical properties of the alloy. The high-temperature tensile strength of the alloy with a 1:1 Mn/Ag ratio is the highest, reaching 135.89 MPa, 42.95% higher than that of the as-cast alloy. The analysis shows that a synergistic effect between Mn and Ag elements can promote the precipitation and refinement of the θ′-Al<sub>2</sub>Cu phase, and there is an optimal ratio (1:1) that obtains the lowest interfacial energy for co-segregation of Mn and Ag at the θ′/Al interface that makes θ′-Al<sub>2</sub>Cu have the best resistance to coarsening.https://www.mdpi.com/1996-1944/17/6/1371Al-Cu-Mn-Ag alloyMn/Ag ratiomicrostructurehigh-temperature tensile mechanical property |
| spellingShingle | Xiangzhou Fu Hailong Yang Hanzhang Wang Chifu Huang Yongbin Chen Qiangang Huang Anmin Li Liwen Pan Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys Materials Al-Cu-Mn-Ag alloy Mn/Ag ratio microstructure high-temperature tensile mechanical property |
| title | Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys |
| title_full | Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys |
| title_fullStr | Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys |
| title_full_unstemmed | Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys |
| title_short | Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys |
| title_sort | effect of mn ag ratio on microstructure and mechanical properties of heat resistant al cu alloys |
| topic | Al-Cu-Mn-Ag alloy Mn/Ag ratio microstructure high-temperature tensile mechanical property |
| url | https://www.mdpi.com/1996-1944/17/6/1371 |
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