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本文研究了真空处理态和烧结态的GW-7W合金微观结构、氢含量和力学性能以及拉伸、断裂韧性试样断口的微观形貌。指出经过1200℃真空处理,合金中的氢降低,钨颗粒和基体界面之间结合力加强,抗拉强度和延伸率大幅度提高。由于断裂韧性是强度和延性的综合表现,随着合金延伸率和抗拉强度的增加,韧性得到改善。另外由于消除氢脆,钨颗粒和基体之间结合力增强,裂纹沿合适位向的(001)面扩展的机率增多,所以真空处理后的GW-7W合金,拉伸和断裂韧性试样断口解理面比烧结态试样增多。
In this paper, the microstructure, hydrogen content and mechanical properties of the vacuum treated and sintered GW-7W alloy as well as the microstructures of the tensile and fracture toughness specimens were studied. It is pointed out that after the vacuum treatment at 1200 ℃, the hydrogen in the alloy decreases and the binding force between the tungsten particles and the matrix interface is strengthened, and the tensile strength and elongation increase greatly. Since fracture toughness is a combination of strength and ductility, the toughness improves as the alloy elongation and tensile strength increase. In addition, due to the elimination of hydrogen embrittlement, the binding force between the tungsten particles and the matrix is enhanced, and the probability of the crack expanding along the (001) plane in the proper orientation is increased. Therefore, the fracture treatment of the GW-7W alloy after vacuum treatment and the tensile and fracture toughness specimens Noodles than sintered samples increased.