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微量稀土元素可以显著提高硬质合金的强度,韧性等力学性能,但稀土元素在硬质合金的中存在形式、分布状态,特别是稀土相的结构还未见报导。我们选用加入了约40ppm稀土钇(Y)的Wc—Co硬质合金作为研究对象,采用JEM-2000FX电镜观察薄膜样品的显微组织。由於稀土相与Co相衬度小,不易区别,采用X-射线能谱及能量损失谱判别稀土Y相的位置、分布,确定其元素组成。下图照片中部尺寸约300nm的球形颗粒为稀土Y相,Y相左右两侧的亮区为Co相,其余部分为Wc相。Y相存在於Co相与Wc相之间,大约从30
Trace rare earth elements can significantly improve the strength, toughness and other mechanical properties of cemented carbides, but the rare earth elements present in cemented carbide in the form, distribution, especially the structure of the rare earth phase has not been reported. We chose Wc-Co Cemented Carbide with about 40 ppm rare earth yttrium (Y) as the research object, and the microstructure of the film samples was observed with JEM-2000FX electron microscope. Due to the small phase contrast between rare earth and Co, it is difficult to distinguish the rare earth Y phase from the X-ray energy spectrum and energy loss spectrum to determine its elemental composition. In the picture below, the spherical particles with a central size of about 300 nm are rare earth Y phases, the bright areas on the left and right sides of the Y phase are Co phases, and the rest are Wc phases. The Y phase exists between the Co phase and the Wc phase, about 30