机械合金化-热处理制备V5Si3材料

[目的]为了获得V/Si类化合物基本结构和性能,拟合成V/Si系金属间化合物V_5Si_3。[方法]采用V粉和Si粉作原料,按照原子比V∶Si=5∶3进行称量,通过机械合金化与热处理制备V_5Si_3,再利用XRD,SEM/EDS等方法对球磨粉体试样和热处理试样的物相组成、微观形貌和微区成分进行分析与表征,并测量其抗压性能和硬度。[结果]V/Si粉体经过球磨后颗粒度减小,逐渐非晶化,最终得到以原子比V∶Si=5∶3结合的非晶态物质;经过热处理,非晶态结构转变为V_5Si_3晶体。[结论]随着热处理温度的升高,晶体结晶度提高,材料的抗压强度和显微硬度增加,抗压强度达到640 MPa,显微硬度最高为656 MPa。

Mechanical Alloying and Heat Treatment of V5Si3 Intermetallic Compound

[Objective] The V/Si intermetallic compound V₅Si₃ was synthesized in order to get the basic structure and properties of V/Si type compounds.[Methods] Both V and Si powders were used as materials, and their atom ratio was set at 5:3.The V/Si intermetallic compound V₅Si₃ was produced by mechanical alloying and subsequent heat treatment.Its microstructure and phase constitution were analyzed with SEM/EDX and X-ray techniques.Also, their compressive properties and hardness were measured.[Results] The particles'' size reduced after milling and the powder transformed to the amorphous powder gradually.The amorphous substance of V:Si=5:3 was fabricated ultimately.With subsequent heat treatment, the amorphous structure transformed to be crystallographic.[Conclusion] With the increase in treatment temperature, this compound becomes higher crystallinity, compressive strength and microhardness.Its compressive strength was up to 640 MPa and microhardness up to 656 MPa.