Crystallite size and strain calculations of hard particle reinforced composite powders (Cu/Ni/Fe–WC) synthesized via mechanical alloying

Estonian Academy of Sciences. Proceedings

Aydın Şelte¹ 

关键词: transition elements;    tungsten carbide;    mechanical alloying;    nanocrystalline materials;    Williamson–Hall method;    Lorentzian function.;   

DOI  :  10.3176/proc.2019.1.02

学科分类：化学（综合）

来源: Teaduste Akadeemia Kirjastus

【 摘 要 】

In this study, Cu–25WC, Ni–25WC, and Fe–25WC (all in wt%) composite powders were produced via mechanicalalloying (MA) and characterized for their potential utilization in particulate materials based technologies. The changes in thecrystallite size (D) and lattice strain (ε) during the production of WC particle reinforced Cu, Fe, and Ni composite powders viaMA were investigated. The Williamson–Hall (W–H) plot analysis and fundamental parameters approach (FPA) applied withLorentzian function were used to evaluate ε and D of matrix phases from XRD results. With increasing MA, ε values of all matrixphases showed an increase whereas D values showed a decrease. In addition to that, lattice parameters aCu and aNi changed linearlywith time, and aFe displayed a slight decrease. The XRD peak belonging to the Cu (111) plane shifted towards larger 2-thetaangles in the same direction. Contrary to Cu, the Fe (110) peak shifted to lower angles with MA time. However, the XRD peakbelonging to the Ni (111) plane changed alternately. Similar results were obtained from both W–H plot analysis and the FPAcalculations. Minimum crystallite size and maximum internal strain rates were estimated for 8 h MA’ed Cu25WC, Fe25WC, andNi25WC composite powders as 14.63 nm and 1.39%, 7.60 nm and 1.23%, and 17.65 nm and 1.13%, respectively. Transmissionelectron microscope observations were found in good agreement with the crystallite size of XRD calculations.

【 授权许可】

CC BY-NC