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After the addition of carbon, the microhardness in the grain boundary is about 150 MPa higher than that in the grain. The fracture type of pure Mo is intergranular fracture, the grain boundary strength of Mo-C alloy is strengthened due to the addition of carbon and the fracture type is changed to transgranular fracture, transcrystalline fracture and a large number of cleavage planes and steps are observed on the bending fracture surface. But if the carbon content is too high, the carbide precipitation will be severe at grain boundaries and is deleterioated to the ductility of the alloy.
添加碳后,合金的晶界显微硬度比合金的晶内显微硬度高150MPa左右;纯钼的断裂方式以沿晶断裂为主,添加碳后,由于合金的晶界强度得到提高,合金的断裂方式变成以穿晶断裂为主,断口上有大量的解理面,具有明显的河流状花样和解理台阶,且塑性越好的断口,撕裂岭也越多;当添加的碳含量偏高时,在晶界处产生了大颗粒的碳化物,这种大颗粒的碳化物会降低合金的塑性。
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schistosity:片理
有明显的片理(schistosity)构造,由分裂的、主要以云母矿为主的平行片层构成的各种中等纹理及粗纹理的区域变质岩,片理常呈波浪状的弯曲构造,常顺着解理面剥离.
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kyanite:蓝晶石
概述 蓝晶石 (Kyanite) 英文名称: kyanite . 晶体属三斜晶系的岛状结构硅酸盐矿物. 蓝晶石与红柱石、夕线石成同质多象. 晶体呈扁平的板条状. 有时呈放射状集合体. 蓝色、带蓝的白色、青色. 具完全和中等的两组解理. 硬度有明显的异向性,