Corrosion-Resistance of Ni&lt;sub&gt;3&lt;/sub&gt;Al Intermetallic Compounds Containing Cr Synthesized via Spark Plasma Sintering Process

Liu, Nian; Zhang, Guo Dong; Wu, Jinliang; Zhang, Fu Ju; Zhang, Jian Qiang

doi:10.4028/www.scientific.net/amr.581-582.1006

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(1 citation statement)

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“…Ni 3 Al has highly ordered L1 2 -type cubic structure with space group Pm3 ത m and are known to be the hardest phase in the Ni-Al system [5,6]. Alloying Ni 3 Al with chromium reduces the amount of aluminum required to form Al 2 O 3 which acts as protective coating in oxidizing and corrosive environments [7,8]. Addition of Cr forms a two-phase composite system consisting of γ and γ' phases [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of B and Cr on elastic strength and crystal structure of Ni3Al alloys under high pressure

Raju¹,

Oni²,

Godwal³

et al. 2015

Journal of Alloys and Compounds

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Samples of Ni 3 Al, Ni 3 Al:B and Ni-Al-Cr super alloys were prepared by directional solidification method and their effect of alloying with ternary elements on the mechanical properties was investigated. In-situ x-ray diffraction studies were carried out on undoped Ni 3 Al, Ni 3 Al:B with boron 500ppm and Ni-Al-Cr with 7.5 at% of chromium super alloys at high pressure using diamond anvil cell. The results indicate that micro-alloying with B forms γ'phase (L1 2 structure), similar to the pure Ni 3 Al, while Ni-Al-Cr alloy consists of γ' precipitates in a matrix of γ-phase (Ni-FCC structure). The crystal structure of all three alloys was stable up to 20 GPa. Micro alloying with boron increases bulk modulus of Ni 3 Al by 8% whereas alloying with chromium has the opposite effect decreasing the modulus by 11% when compared to undoped alloy. Further, the elastic modulus and hardness of Ni 3 Al, Ni 3 Al:B and Ni-Al-Cr alloys were determined using the nano-indentation technique, in combination with compressibility data which enabled the estimation of shear modulus and Poisson's ratio of these alloys.

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Section: Introductionmentioning

confidence: 99%