Microstructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing
A TNM alloy ingot was fabricated with powder hot isostatic pressing (P-HIP) and short-time exposure treatment conducted at 750–1050 °C for 2–5 h. The tensile mechanical properties were investigated at room temperature and 800 °C. The results revealed that a fully lamellar microstructure of P-HIPed T...
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2021
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oai:doaj.org-article:da8cfa3dc04c4b6497705ef2611192282021-11-25T18:21:28ZMicrostructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing10.3390/met111117202075-4701https://doaj.org/article/da8cfa3dc04c4b6497705ef2611192282021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1720https://doaj.org/toc/2075-4701A TNM alloy ingot was fabricated with powder hot isostatic pressing (P-HIP) and short-time exposure treatment conducted at 750–1050 °C for 2–5 h. The tensile mechanical properties were investigated at room temperature and 800 °C. The results revealed that a fully lamellar microstructure of P-HIPed TNM alloy with only 0.3 vol.% β<sub>0</sub> phase could be obtained by hot isostatic pressing at 1260 °C, under the pressure of 170 MPa, held for 4 h. When the exposure temperature was below 850 °C, the α<sub>2</sub> lamellae were transformed into nano-scaled (α<sub>2</sub> + γ) lamellae (i.e., the α<sub>2</sub>→α<sub>2</sub> + γ transformation). With increases in the exposure temperature, the β<sub>0</sub> phase began to precipitate within the α<sub>2</sub> lamellae (α<sub>2</sub>→β<sub>0</sub> transformation) at 950 °C. The α<sub>2</sub>→γ and the α<sub>2</sub>→β<sub>0</sub> transformation both happened at 950–1050 °C, and the higher exposure temperature accelerated the diffusion of Mo and facilitated the α<sub>2</sub>→β<sub>0</sub> transformation. The yield strength and elongation at RT and 800 °C were both improved after short-time high-temperature exposure treatment. The uniform distribution and nano-scaled interfacial β<sub>0</sub> phase provided precipitation strengthening and were not harmful to the elongation.Yichao WangXiangyi XueHongchao KouFengming QiangYonghao YuZhongwei YinJinshan LiMDPI AGarticleTiAl-based alloyshot isostatic pressingmicrostructurethermal stabilitytensile propertiesMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1720, p 1720 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
TiAl-based alloys hot isostatic pressing microstructure thermal stability tensile properties Mining engineering. Metallurgy TN1-997 |
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TiAl-based alloys hot isostatic pressing microstructure thermal stability tensile properties Mining engineering. Metallurgy TN1-997 Yichao Wang Xiangyi Xue Hongchao Kou Fengming Qiang Yonghao Yu Zhongwei Yin Jinshan Li Microstructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing |
| description |
A TNM alloy ingot was fabricated with powder hot isostatic pressing (P-HIP) and short-time exposure treatment conducted at 750–1050 °C for 2–5 h. The tensile mechanical properties were investigated at room temperature and 800 °C. The results revealed that a fully lamellar microstructure of P-HIPed TNM alloy with only 0.3 vol.% β<sub>0</sub> phase could be obtained by hot isostatic pressing at 1260 °C, under the pressure of 170 MPa, held for 4 h. When the exposure temperature was below 850 °C, the α<sub>2</sub> lamellae were transformed into nano-scaled (α<sub>2</sub> + γ) lamellae (i.e., the α<sub>2</sub>→α<sub>2</sub> + γ transformation). With increases in the exposure temperature, the β<sub>0</sub> phase began to precipitate within the α<sub>2</sub> lamellae (α<sub>2</sub>→β<sub>0</sub> transformation) at 950 °C. The α<sub>2</sub>→γ and the α<sub>2</sub>→β<sub>0</sub> transformation both happened at 950–1050 °C, and the higher exposure temperature accelerated the diffusion of Mo and facilitated the α<sub>2</sub>→β<sub>0</sub> transformation. The yield strength and elongation at RT and 800 °C were both improved after short-time high-temperature exposure treatment. The uniform distribution and nano-scaled interfacial β<sub>0</sub> phase provided precipitation strengthening and were not harmful to the elongation. |
| format |
article |
| author |
Yichao Wang Xiangyi Xue Hongchao Kou Fengming Qiang Yonghao Yu Zhongwei Yin Jinshan Li |
| author_facet |
Yichao Wang Xiangyi Xue Hongchao Kou Fengming Qiang Yonghao Yu Zhongwei Yin Jinshan Li |
| author_sort |
Yichao Wang |
| title |
Microstructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing |
| title_short |
Microstructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing |
| title_full |
Microstructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing |
| title_fullStr |
Microstructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing |
| title_full_unstemmed |
Microstructure Characterization and Thermal Stability of TNM Alloy Fabricated by Powder Hot Isostatic Pressing |
| title_sort |
microstructure characterization and thermal stability of tnm alloy fabricated by powder hot isostatic pressing |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/da8cfa3dc04c4b6497705ef261119228 |
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| _version_ |
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