Molybdenum tungsten alloy
Alloys containing molybdenum and tungsten, including molybdenum-based molybdenum-tungsten alloys and tungsten-molybdenum alloy series based on tungsten. The alloy can be formed in any proportion and is a complete solid solution alloy at all temperatures.
Niobium tungsten alloy
A niobium alloy based on the addition of a certain amount of tungsten and other elements. Tungsten and niobium form an infinite solid solution. Tungsten is an effective strengthening element for niobium, but with the increase of the amount of tungsten, the ductility and brittleness transition temperature of the alloy will increase, and the grain size will grow significantly. Therefore, in order to obtain the high strength niobium-tungsten alloy, the amount of tungsten must be controlled properly, and the elements such as zirconium and hafnium, which refine the grain and reduce the plastic-brittle transition temperature, must be added appropriately. In 1961, the United States successfully developed Nb-10W-2.5Zr alloy for the skin of the space shuttle, and later developed into Nb-10W-1Zr-0.1C alloy. In the early 1970s, China also successfully developed nbWL0ZR2.5 and NbWl0Zr1C0.1 alloys.
Lightweight alloy
Al-li alloy has the characteristics of high specific strength (breaking strength/density), high specific stiffness and low relative density. For example, as a modern aircraft skin material, a large passenger aircraft weight can be reduced by 50 kg. A Boeing 747, for example, earns $2, 000 a year for every kilogram lost. Titanium alloy is lighter than steel, corrosion resistant, non-magnetic, high strength, is an ideal material for aviation and naval ships.
Hydrogen storage alloy
Due to the limited reserves of oil and coal, and the problems such as environmental pollution in the use process, especially the global oil crisis in 1970s, hydrogen energy as a new clean fuel has become a research hotspot. In the process of hydrogen energy utilization, hydrogen storage and transportation is an important link. LaNi5 hydrogen storage alloy was developed by a company in 1969. It has the properties of reversible absorption and release of hydrogen in large quantities. The hydrogen density of the alloy hydride LaNi5H6 is equivalent to that of liquid hydrogen, about 1 000 times that of hydrogen.
