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C元素是提高金属材料高温性能的重要元素之一。研究C元素对β-TiAl合金(Ti-45Al-3Fe-2Mo,摩尔分数,%)的高温压缩性能(750~850℃)及蠕变性能(750℃,150~300 MPa)的影响。结果表明,C元素的加入明显提高β-TiAl合金的高温压缩强度及蠕变抗力。添加C元素后,在β-TiAl合金中形成了纳米尺度的Ti3Al C碳化物相,碳化物可以钉扎位错,从而大幅提高材料的高温性能。同时,C元素的添加还降低β相含量,细化层片结构,引起固溶强化,这些因素的共同作用都有效提高合金的高温性能。
The C element is one of the important elements to improve the high-temperature performance of a metal material. The effect of C element on the high temperature compression (750-850 ℃) and creep (750 ℃, 150-300 MPa) of β-TiAl alloy (Ti-45Al-3Fe-2Mo, mole fraction,%) was studied. The results show that the addition of C element obviously improves the high temperature compressive strength and creep resistance of β-TiAl alloy. After adding C element, a nano-scale Ti3Al C carbide phase is formed in the β-TiAl alloy, and the carbide can pin the dislocation, thereby greatly improving the high-temperature performance of the material. At the same time, the addition of C element also reduced the content of β phase, refine the lamellar structure and cause solid solution strengthening. The combination of these factors can effectively improve the high temperature performance of the alloy.