Transformation from D0<sub>22</sub> to L1<sub>2</sub> in Al<sub>3</sub>Ti by Fe Addition for Enhanced Wear Resistance
The addition of third elements may help transform brittle D0<sub>22</sub>-structured lightweight Al<sub>3</sub>Ti to a relatively ductile L1<sub>2</sub>-structured (Al, M)<sub>3</sub>Ti (where M represents the third elements), thus increasing the ducti...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
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| Series: | Lubricants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4442/12/11/398 |
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| Summary: | The addition of third elements may help transform brittle D0<sub>22</sub>-structured lightweight Al<sub>3</sub>Ti to a relatively ductile L1<sub>2</sub>-structured (Al, M)<sub>3</sub>Ti (where M represents the third elements), thus increasing the ductility at the expense of hardness. Such a transformation could benefit the wear resistance of the alloy due to improved toughness if a proper balance between the hardness and ductility is achieved. In this work, a D0<sub>22</sub>-predominant Al<sub>3</sub>Ti alloy (S-Al<sub>3</sub>Ti) and an L1<sub>2</sub>-predominant (Al, Fe)<sub>3</sub>Ti alloy (S-Al<sub>67</sub>Ti<sub>25</sub>Fe<sub>8</sub>) were fabricated by arc melting. Change in wear resistance, corresponding to a D0<sub>22</sub>-to-L1<sub>2</sub> transformation, caused by the addition of Fe as a representative third element, was investigated and compared with the wear resistance of a commercial Al-matrix composite reinforced by 30 wt.% SiC particles (S-Al/SiC<sub>p</sub>) as a reference material. It was observed that wear of the S-Al<sub>3</sub>Ti resulted from abrasion involving synergistic oxidation, leading to a larger volume loss. In contrast, the softer S-Al<sub>67</sub>Ti<sub>25</sub>Fe<sub>8</sub> showed enhanced wear resistance, benefiting from improved toughness with reasonable hardness. During the wear testing, both the alloys exhibited better performance than S-Al/SiC<sub>p</sub>, a well-known lightweight composite. This study highlights that D0<sub>22</sub>-to-L1<sub>2</sub> transformation enhances wear resistance due to increased toughness which can be adjusted using the addition of a third element. |
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| ISSN: | 2075-4442 |