Synthesis of Ti-6Al-4V alloy with nano-TiN microstructure via spark plasma sintering technique

Abstract: The effect of nano-TiN dispersion strengthened Ti-6Al-4V via spark plasma sintering method has been investigated. Ti-6Al-4V with 4 vol. percent of nano-TiN were mixed in a Turbula shaker mixer for 8 h at a speed of 49 rpm and the admixed powders were sintered at sintering temperature range of 1000 - 1100 oC, holding time of 10-30 mins, heating rate of 100 oC/min under an applied pressure of 50 MPa. The morphology of the as-received and sintered compacts was examined by scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) and phase analysis was done by X-ray diffractometry (XRD). The sintered compacts without nano-TiN reveal lamellar structure while reinforced Ti- 6Al-4V with nano-TiN shows a bimodal structure and titanium nitride has a great influence on α grain growth at high temperature. Furthermore, the microstructural formation mechanism was investigated. With the addition of the content of Ti-6Al-4V with 4 vol.% of nano-TiN, the microhardness also improved and this was due to homogenous distribution of TiN in Ti-6Al-4V matrix

Influence of sintering temperature on hardness and wear properties of TiN Nano reinforced SAF 2205

Abstract: Conventional duplex stainless steel degrade in wear and mechanical properties at high temperature. Attempts have been made by researchers to solve this problems leading to the dispersion of second phase particles into duplex matrix. Powder metallurgy methods have been used to fabricate dispersion strengthened steels with a challenge of obtaining fully dense composite and grain growth. This could be resolved by appropriate selection of sintering parameters especially temperature. In this research, spark plasma sintering was utilized to fabricate nanostructured duplex stainless steel grade SAF 2205 with 5 wt.% nano TiN addition at different temperatures ranging from 1000 °C to 1200 °C. The effect of sintering temperature on the microstructure, density, hardness and wear of the samples was investigated. The results showed that the densities and grain sizes of the sintered nanocomposites increased with increasing the sintering temperature. The microstructures reveal ferrite and austenite grains with fine precipitates within the ferrite grains. The study of the hardness and wear behaviors, of the samples indicated that the optimum properties were obtained for the sintering temperature of 1150 °C

Nanomaterials

This chapter introduces the basic concept of nanocomposite materials. It starts by presenting a high-level functional classification of smart nanocomposites, with a brief description of an array of widely used organic and inorganic anticorrosive nanomeric matrices and reinforcement materials. To lay a suitable foundation on the subject, detailed discussions on the synthesis, characterization, properties, and applications of nanocomposites are included. Special emphasis is given to discussions on the formulation and utilization of nanocomposite coatings and solutions for metallic corrosion protection. The chapter closes with a brief discussion on the future trends and opportunities for improving the anticorrosion property, performance, and applications of nanocomposites