The results of the investigations by scanning electron microscopy, Auger spectroscopy and X-ray diffraction of the structure of Т5К10 cemented carbide (WC-(Ti,W)C-10Co group) sintered at 1520 °C before and after its additional heat treatment in vacuum at 1200 °C for 7 h are presented. It was shown that in addition to faceted WC grains, globular (Ti,W)C (γ-phase) grains of equilibrium (ratio Ti:W ~ 1:3) chemical composition for sintering temperature 1520 °C and Co-based layers, new inclusions of elongated shape up to 30 μm wide and up to 200 μm long were revealed in the structure. They are distributed stochastic both singly and in the form of clusters. The new phase contains the chemical elements W, Ti, C in the ratio (wt%) of the average values as 6.26:9.39:84.35, which is described by the stoichiometric formula W_2.3TiС_2.6. In contrast to the cubic cell of (Ti,W)C solid solution, the new phase has a hexagonal GaSe type crystal cell (quality H) with parameters a = 3.750 nm and c = 15.950 nm. On the surfaces of the new phase there are dispersed grains WС and (Ti,W)С solid solution, the sizes of which are 3–6 times smaller than the sizes of similar grains of the basic structure. The content (4.77%) of C in the dispersed grains of WC and in the same grains of the main structure is less than the calculated one. The cobalt phase in the adjacent surface of the new phase of the basic structure is superseded by W (3.57%) and C (0.85%).

The formation of a new phase W_2.3ТіС_2.6 elongated shape in the structure of the T5K10 cemented carbide for the above annealing conditions cannot be explained by the basics of modern material science of its production.

通过扫描电子显微镜，俄歇光谱和X射线衍射研究的结果，对在1520°C烧结的Т5К10硬质合金（WC-（Ti，W）C-10Co组）的结构进行了进一步的热处理，然后对其进行了热处理。介绍了在1200°C下真空7 h。结果表明，除了刻面的WC晶粒外，烧结温度为1520°C的Co（Co）层的球状（Ti，W）C（γ相）平衡（Ti：W〜1：3比率）化学成分的合金颗粒，在结构中发现了新的细长形状的夹杂物，宽度最大为30μm，最大长度为200μm。它们是随机分布的，既可以单独分布，也可以成簇分布。新相包含化学元素W，Ti，C，其平均值的比率（wt％）为6.26：9.39：84.35，由化学计量公式W _2.3描述TiС _2.6。与（Ti，W）C固溶体的立方晶胞相反，新相具有六方GaSe型晶体晶胞（质量H），参数a  = 3.750 nm和c  = 15.950 nm。在新相的表面上有分散的晶粒W？和（Ti，W）？固溶体，其尺寸是基本结构中类似晶粒的尺寸的3-6倍。WC的分散晶粒和主结构的相同晶粒中的C含量（4.77％）小于计算值。基本结构的新相的相邻表面中的钴相被W（3.57％）和C（0.85％）取代。

一个新的相位W的形成_2.3 ТіС _2.6细长形状在T5K10的结构硬质合金用于上述退火条件不能由它的生产的现代材料科学的基础知识来解释。