Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy
Composite micro-alloying is an important technique for developing cost-effective, high-performance aluminum alloys. Here, the effect of combined addition of Zr, Ti and rare-earth Y on the microstructure and tensile properties of an Al-7.6Zn-1.6 Mg-2.1Cu (wt.%) alloy is systematically investigated by...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522007511 |
| _version_ | 1811249602454618112 |
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| author | Jiaheng Li Yingbo Zhang Mojia Li Yunfeng Hu Qi Zeng Pu Zhang |
| author_facet | Jiaheng Li Yingbo Zhang Mojia Li Yunfeng Hu Qi Zeng Pu Zhang |
| author_sort | Jiaheng Li |
| collection | DOAJ |
| description | Composite micro-alloying is an important technique for developing cost-effective, high-performance aluminum alloys. Here, the effect of combined addition of Zr, Ti and rare-earth Y on the microstructure and tensile properties of an Al-7.6Zn-1.6 Mg-2.1Cu (wt.%) alloy is systematically investigated by means of X-ray diffraction, optical microscopy, scanning electron microscopy, transmission electron microscopy and room-temperature unixal tensile tests. After adding 0.12 %Zr, 0.04 %Ti and 0.28 %Y, L12-Al3Zr/(Al,Zn)3Zr, AlMgZnTiCuFe and (Al,Zn)8Cu4Y phases were induced; the as-T6 treated microstructure of the base alloy changed from fully recrystallized to fully unrecrystallized, accompanied by strong 〈100〉 + 〈111〉 fiber textures along extrusion direction. As a result, the Al-Zn-Mg-Cu-Zr-Ti-Y alloy with low Zn and Mg contents exhibits an ultimate tensile strength of 692 MPa, yield strength of 647 MPa (∼36 % higher than the base alloy) and 6.8 % elongation. The main strengthening mechanisms responsible for this high yield strength are Orowan dislocation bypassing strengthening (∼449 MPa), fiber texture strengthening, and dispersion strengthening. Moreover, the synergistic strengthening effect of rare-earth Y and transitional element(s) Zr and/or Ti was revealed, which may be related to the formation(s) of nanoscale network-structured Al8Cu4Y and/or L12-Al3(Zr,Y) phase(s). The massive formation of the Al8Cu4Y network structure requires a narrow process window. |
| first_indexed | 2024-04-12T15:49:28Z |
| format | Article |
| id | doaj.art-2ee471c4ef7e4f4c8a2318e87e0b2712 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-12T15:49:28Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-2ee471c4ef7e4f4c8a2318e87e0b27122022-12-22T03:26:33ZengElsevierMaterials & Design0264-12752022-11-01223111129Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloyJiaheng Li0Yingbo Zhang1Mojia Li2Yunfeng Hu3Qi Zeng4Pu Zhang5School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaCorresponding author.; School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaComposite micro-alloying is an important technique for developing cost-effective, high-performance aluminum alloys. Here, the effect of combined addition of Zr, Ti and rare-earth Y on the microstructure and tensile properties of an Al-7.6Zn-1.6 Mg-2.1Cu (wt.%) alloy is systematically investigated by means of X-ray diffraction, optical microscopy, scanning electron microscopy, transmission electron microscopy and room-temperature unixal tensile tests. After adding 0.12 %Zr, 0.04 %Ti and 0.28 %Y, L12-Al3Zr/(Al,Zn)3Zr, AlMgZnTiCuFe and (Al,Zn)8Cu4Y phases were induced; the as-T6 treated microstructure of the base alloy changed from fully recrystallized to fully unrecrystallized, accompanied by strong 〈100〉 + 〈111〉 fiber textures along extrusion direction. As a result, the Al-Zn-Mg-Cu-Zr-Ti-Y alloy with low Zn and Mg contents exhibits an ultimate tensile strength of 692 MPa, yield strength of 647 MPa (∼36 % higher than the base alloy) and 6.8 % elongation. The main strengthening mechanisms responsible for this high yield strength are Orowan dislocation bypassing strengthening (∼449 MPa), fiber texture strengthening, and dispersion strengthening. Moreover, the synergistic strengthening effect of rare-earth Y and transitional element(s) Zr and/or Ti was revealed, which may be related to the formation(s) of nanoscale network-structured Al8Cu4Y and/or L12-Al3(Zr,Y) phase(s). The massive formation of the Al8Cu4Y network structure requires a narrow process window.http://www.sciencedirect.com/science/article/pii/S0264127522007511Al-Zn-Mg-Cu alloyComposite micro-alloyingRare-earth elementMicrostructureMechanical property |
| spellingShingle | Jiaheng Li Yingbo Zhang Mojia Li Yunfeng Hu Qi Zeng Pu Zhang Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy Materials & Design Al-Zn-Mg-Cu alloy Composite micro-alloying Rare-earth element Microstructure Mechanical property |
| title | Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy |
| title_full | Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy |
| title_fullStr | Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy |
| title_full_unstemmed | Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy |
| title_short | Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy |
| title_sort | effect of combined addition of zr ti and y on microstructure and tensile properties of an al zn mg cu alloy |
| topic | Al-Zn-Mg-Cu alloy Composite micro-alloying Rare-earth element Microstructure Mechanical property |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522007511 |
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