Publication Date:
2019
Description:
〈p〉Publication date: 15 May 2019〈/p〉
〈p〉〈b〉Source:〈/b〉 Acta Materialia, Volume 170〈/p〉
〈p〉Author(s): Yuechao Chen, Cuiping Wang, Jingjing Ruan, Toshihiro Omori, Ryosuke Kainuma, Kiyohito Ishida, Xingjun Liu〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉The γ/γ′ two-phase Co–Al–V-base superalloys are investigated in detail, including their phase equilibria, alloying effects, and alloy design. The experimental proof of the existence of a ternary compound with an L1〈sub〉2〈/sub〉-ordered γ′-Co〈sub〉3〈/sub〉(Al, V) phase is provided in this study, and the γ/γ′ two-phase Co–5Al–14V (at.%) alloy is designed. The γ′-Co〈sub〉3〈/sub〉(Al,V) phase is proved to be thermodynamically stable at 900 °C, and a wide γ/γ′ two-phase composition region in the Co–Al–V ternary phase diagram at 900 °C is identified. The performed investigation of Co–5Al–14V-2X (X: Ti, Cr, Nb, Mo, Ta, and W) and Co-xNi-8Al–12V (x = 10, 20, and 30) quaternary alloys revealed that Ti, Nb, Mo, Ta, W, and Ni tend to concentrate in the γ′ phase, whereas Cr tends to partition to the γ matrix. Besides, the γ/γ′ two-phase Co–30Ni–10Al–5V–4Ta–2Ti (30Ni4Ta2Ti) alloy is designed. The 30Ni4Ta2Ti alloy exhibits a very high γ′ solvus temperature (namely, 1242 ± 3 °C) combined with a low density (8.46 ± 0.08 g cm〈sup〉−3〈/sup〉), which characteristics are comparable with those of the Mar-M-247 Ni-base superalloy. Moreover, the nominal and the specific yield strength values of the obtained 30Ni4Ta2Ti alloy within the temperature range from 600 to 900 °C are also close to those of the Mar-M-247 superalloy.〈/p〉〈/div〉
〈/div〉
〈h5〉Graphical abstract〈/h5〉
〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S1359645419301466-fx1.jpg" width="500" alt="Image 1" title="Image 1"〉〈/figure〉〈/p〉〈/div〉
Print ISSN:
1359-6454
Electronic ISSN:
1873-2453
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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