NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by Ta
A technology of intermetallic compounds and eutectic metals, which is applied in the field of Ta-modified NiAl-Cr(Mo) dual-phase eutectic intermetallic compounds, can solve the problems of little improvement in high temperature strength and failure to meet the use requirements, and achieve good Comprehensive performance and the effect of improving high temperature strength
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Embodiment 1
[0030] Example 1: Preparation of 33Ni-28Al-30Cr-4Mo-5Ta intermetallic compound
[0031] The ingredients are formulated according to the composition of 33Ni-28Al-30Cr-4Mo-5Ta (atomic percentage), and the purity of the raw materials is 99.999%.
[0032] Melting 33Ni-28Al-30Cr-4Mo-5Ta alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 5×10 -3 Pa, smelting temperature 3000°C, smelting 4 times, the raw materials are smelted evenly.
[0033] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.
[0034] A cylindrical sample with a diameter of 6mm and a height of 9mm and a square cylinder with a diameter of 6mm×6mm×30mm were cut from the heat-treated 33Ni-28Al-30Cr-4Mo-5Ta ingot by the wire cutting method for mechanical performance testing.
[0035] Accurate to 10 with Model 1111 -4 The mass M of the sample is measured by an el...
Embodiment 2
[0037] Example 2: Preparation of 33Ni-30Al-30Cr-4Mo-3Ta intermetallic compound
[0038] The ingredients are 33Ni-30Al-30Cr-4Mo-3Ta (atomic percentage), and the purity of the raw materials is 99.999%.
[0039] Melting 33Ni-30Al-30Cr-4Mo-3Ta alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 3×10 -3 Pa, the melting temperature is 2700°C, smelting 6 times, and the raw materials are smelted evenly.
[0040] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.
[0041] The mechanical property test condition of 33Ni-30Al-30Cr-4Mo-3Ta intermetallic compound is identical with embodiment 1, and its density is 6.28g / cm 3 ; see figure 2 As shown in the figure, the yield strength at 25°C is 1380MPa, and the compressive plasticity is greater than 20%; the yield strength at 800°C is 450MPa, and the compressive plasticity is greater ...
Embodiment 3
[0042] Example 3: Preparation of 33Ni-25Al-30Cr-4Mo-8Ta intermetallic compound
[0043] The ingredients are formulated according to the composition of 33Ni-25Al-30Cr-4Mo-8Ta (atomic percentage), and the purity of the raw materials is 99.999%.
[0044] Melting 33Ni-25Al-30Cr-4Mo-8Ta alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 4×10 -3 Pa, smelting temperature 3000°C, smelting 4 times, the raw materials are smelted evenly.
[0045] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.
[0046] The mechanical property test condition of 33Ni-25Al-30Cr-4Mo-8Ta intermetallic compound is identical with embodiment 1, and its density is 6.51g / cm 3 ; see image 3 As shown in the figure, the yield strength at 25°C is 1880MPa, and the compressive plasticity is greater than 15%; the yield strength at 800°C is 720MPa, and the co...
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