Static Tensile Properties near Ductile-Brittle Transition Temperature Region of W-based Composites Doped with Y2O3
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摘要: 制备了掺杂质量分数分别为0.5%,2.0% Y2O3的钨基复合材料,研究了其显微组织,通过不同温度(25~800℃)下的拉伸试验分析了其近韧脆转变温区的变形特性。结果表明:2种复合材料均存在由轧制变形导致的大量位错,Y2O3颗粒对位错运动起到钉扎作用;Y2O3掺杂质量分数为2.0%的复合材料的晶粒更细小,发生韧脆转变的温度更低,在300~400℃拉伸时发生半脆性行为,断口区域位错密度在3.8×1015~3.9×1015 m-2,在600~800℃下发生明显塑性变形,位错密度增加至6.2×1015~6.8×1015 m-2。Abstract: W-based composites doped with 0.5wt% and 2.0wt% Y2O3 were prepared. The microstructure of the composites was investigated. The deformation characteristics near ductile-brittle transition temperature region of the composites were analyzed by tensile tests at different temperatures (25-800℃). The results show that the two composites had a large number of dislocations formed by rolling deformation, and Y2O3 particles played a pinning role in dislocation motion. The composite containing 2.0wt% Y2O3 had smaller grain size and a lower ductile-brittle transition temperature. The semi-brittle behavior of the composite containing 2.0wt% Y2O3 occurred during tension at 300-400℃, and the dislocation density in the fracture area was between 3.8×1015-3.9×1015 m-2; during tension at 600-800℃, plastic deformation occurred, and the dislocation density increased to 6.2×1015-6.8×1015 m-2.
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Keywords:
- Y2O3 /
- W-based composite /
- ductile-brittle transition temperature /
- microstructure
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