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本文用带有拉伸装置的扫描电镜和金相显微镜,研究了纯Nb在室温电解充氢后形变和断裂的动态微观行为。结果表明,Nb的氢化物都在{100}晶面析出,较多的正交针状氢化物能构成魏氏组织。固溶氢的α基体在拉伸变形时,有明显的滑移线和晶界凸起,裂纹萌生在形变带或晶界处。含氢化物的基体在拉伸时表现出完全的脆性,呈穿晶解理断裂。解理面上有各种脆性断裂特征的花样和两种氢化物,裂纹多从氢化物处萌生。
In this paper, the scanning electron microscopy and the metallographic microscope with a tensile device were used to study the dynamic microscopic behavior of pure Nb after deformation and fracture after electrolysis and hydrogen charging at room temperature. The results show that the hydrides of Nb all precipitate in the {100} crystal plane, and the more orthorhombic hydrides can form Widmanstatten. The α matrix of solid solution hydrogen has obvious slip line and grain boundary protrusion during the tensile deformation, and the crack initiation occurs at the deformation zone or grain boundary. The hydride-containing matrix exhibits complete brittleness during stretching and is cleaved by transgranular cleavage. There are a variety of brittle fracture cleavage pattern cleavage patterns and two kinds of hydride, crack initiation from the hydride at.