机械合金化法制备TiNi合金及其表征

发布时间：2018-11-22 08:39

【摘要】：采用机械合金化技术,分别以Ti,Ni及Cu纯元素粉末制备Ti50Ni50合金及Ti50Ni45Cu5合金。利用X线衍射仪(XRD)分析球磨时间、球磨转速以及第3组元Cu的加入对粉末的组成、衍射峰强度和晶格常数变化率的影响,通过扫描电子显微镜(SEM)观察不同条件下粉末的形貌。研究结果表明:随着球磨时间的延长,Ti和Ni的衍射峰强度降低,峰逐渐宽化并向低角度发生偏移;球磨8 h后,获得最大的Ni的晶格常数变化率,并使得粉末粒径最大程度地降低;适当提高球磨转速有利于合金化的进行,400 r/min的球磨转速能够使得Ni最强峰的衍射强度最大限度地降低,粉末粒径降低幅度达65 nm;在Ti和Ni中加入第3组元Cu后,合金化程度略增强。
[Abstract]:Ti50Ni50 alloy and Ti50Ni45Cu5 alloy were prepared by mechanical alloying with pure element powder of Ti,Ni and Cu respectively. The effects of milling time, milling speed and the addition of the third component Cu on the composition of powder, the intensity of diffraction peak and the change rate of lattice constant were analyzed by X-ray diffractometer (XRD). The morphology of the powder under different conditions was observed by scanning electron microscope (SEM) (SEM). The results show that the intensity of diffraction peaks of Ti and Ni decreases with the increase of milling time, and the peaks gradually widen and shift to low angles. After ball-milling for 8 h, the maximum change rate of lattice constant of Ni was obtained, and the particle size of the powder was decreased to the greatest extent. Proper increase of ball milling speed is beneficial to alloying, and 400 r/min ball milling speed can reduce the diffraction intensity of the strongest peak of Ni to the maximum extent, and reduce the range of powder particle size up to 65 nm;. The alloying degree increased slightly after adding the third component Cu to Ti and Ni.
【作者单位】：中南大学粉末冶金国家重点实验室;
【基金】：国家自然科学基金资助项目(51274247) 国家高技术研究发展计划(863计划)项目(2012BAE06B00) 中南大学中央高校基本科研业务费专项资金资助项目(2012zzts012) 湖南省博士生科研创新项目(CX2013D055)~~
【分类号】：TG146.23

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