摘要
M7C3型碳化物的晶体结构对称性和单胞中的原子分布,对M7C3型碳化物的现有结构模型的结构对称性和X射线衍射数据详细分析,选择合金含量27Cr-3.0C(%)的高铬铸铁,在D/MAX-Rb型X-Ray衍射仪上试验得到其衍射数据,利用Materials Studio软件中Reflex模块对已知各种可能的M7C3结构模型进行模拟衍射与现有的PDF[1213]中M7C3型碳化物的X射线衍射数据比较,铁基合金中M7C3型碳化物为具有Pmc21对称性的正交结构,,同时绘出了M7C3型碳化物原子模型的基面投影图。
Symetry of M7C3-type carbide(M = Fe,Cr,Mn,etc) crystal and the positions of atoms in unit cell were investigated based on detailed analyzing the symmetry of the structure and X-ray diffraction data of existing M7C3-type carbide.The high chromium cast iron(HCCI) with normal chemical composition of 27Cr-3.0C(mass%) was selected,diffraction data of which were determined by the D/MAX-Rb type X-ray diffraction apparatus.And simulated X-ray diffraction of the several M7C3 structure models available in the literature was obtained using Reflex module in Materials Studio.By comparing the simulating results with existing PDF cards and the X-ray diffraction data of M7C3-type carbide in this experiment and references,it is found that the structure of M7C3-type carbide in Fe alloys is orthorhombic with the symmetry of Pmc21.The positions of metal and carbon atoms in unit cell are given in detail.Moreover,the basal plane projection of atomic models of M7C3-type carbide is presented.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第11期101-105,共5页
Transactions of Materials and Heat Treatment
