1. Introduction   Generally, niobium (Nb) based alloys withstand high stresses at elevated temperatures. These alloys also exhibit good formability and welding properties. Another advantage of Nb is that it possesses the lowest density (8.57 g/cc) amongst the refractory metals (Mo, Ta, W and Rh...

0 Preface  Titanium-zirconium-molybdenum (TZM) alloys, also known as TZM (Ti-Zr-Mo) alloys, are characterized by high melting points, high strengths, low coefficients of thermal expansion, and excellent high-temperature mechanical properties, which have been widely used in the military industry...

1.Introduction   Molybdenum (Mo) is a silver-grey colored metal with a high density of 10.22 g/ , and a high heat resistance due its melting point of 2610 °C,giving it excellent high temperature mechanical properties. This has made it a frequent choice for components used in crystal growing...

Among the refractory metal materials, tantalum metal (Ta) and tantalum alloys have high melting points, very low tough-brittle transition temperatures, good plastic processing and molding ability, excellent corrosion resistance, wear resistance, creep resistance and high-temperature mechanical prope...

1 Introduction   Ta and Ta alloys have excellent properties such as high density, high melting point, corrosion resistance, excellent high temperature strength, good processability and weldability, and low ductile-brittle transition temperature, and are widely used in various industries such as...

Abstract    Additive Manufacturing (AM) provides a unique opportunity to produce objects with complex shapes and enables the processing of materials with high melting points and difficulty in machining. This study focuses on the characterization of pure niobium and copper 6 GHz cavities fa...

The concept of high-entropy alloys was proposed by Prof. Junwei Ye in 2004, which differs from traditional alloys in that high-entropy alloys have at least five main constituent elements and are mixed in equimolar or near equimolar ratios, with the atomic percentage content of each main constituent...

Tungsten (W) is widely used as a stirring head material for stir friction welding of high melting point alloys such as stainless steel, titanium and titanium alloys, by virtue of its good high temperature strength, high thermal conductivity and excellent wear resistance [1-2]. Although pure tungsten...

1. Introduction    Tungsten heavy alloy (WHA) is a two-phase composite material consisting of W reinforcement particles in a Ni-Fe-based or Ni-Cu-based solid solution matrix [1,2]. Due to their characteristics of high strength, high hardness, and high ductility [3,4], etc., WHAs are widely...

Molybdenum metal has the advantages of high temperature resistance, low vapor pressure, small coefficient of thermal expansion, and good electrical and thermal conductivity. However, pure molybdenum is a typical body-centered cubic structure, there are poor low-temperature ductility, low recrystalli...

  Refractory metals refer to metals with a melting point above 2000 ℃, including tungsten, molybdenum, tantalum, niobium, rhenium and vanadium. This article only covers the first 5. The common characteristics of refractory metals and their alloys are high melting point, high high temperature st...

1 Introduction   Niobium metal, as a metal with low density among refractory metals, has high melting point, high high-temperature strength (highest specific strength in the range of 1093~1427C), good room temperature processing performance, weldability and corrosion resistance, and no radioact...