Aluminium deserves to be called a green metal

Aluminium deserves to be called a green metal

Nowadays, people call aluminium a green metal, an energy-saving metal, a metal with the best recyclability, an energy-storing metal, a light metal, an inexhaustible metal, why does it enjoy so many reputations? This is because it has a range of excellent properties, which we will only briefly touch on here and introduce in more detail in some of our future articles.

One reason why aluminium is known as a green metal is its low density. It is sometimes irregularly described as light in mass, or simply light in mass. According to crystal structure calculations, the theoretical density of single crystal aluminium is 2698.72kt/m3, which is 0.34% higher than that of single crystal, about 1/3 of the density of steel and copper. this is very important, without this, there would not be such a flourishing aerospace industry today, although it cannot be said that there would not be an aerospace industry today without aluminium, but without aluminium, aerospace would not be so flourishing and Without low-density aluminium and aluminium alloys, there would be no high-speed railway trains, which are faster than helicopters!

The second reason why aluminium is called a green metal is that aluminium alloys have moderate mechanical properties. The greater the purity of aluminium, the lower its mechanical properties. It is now possible to make engineering alloys with a tensile strength of up to 750 N/mm2, but of course this is individual, most aluminium alloys have a tensile strength of 500 N/mm2 or less. The mechanical properties of several different purity aluminium are as follows:

As with any other metal and alloy, the mechanical properties of aluminium and aluminium alloys also decline as the temperature rises, and even the most heat-resistant high-temperature aluminium alloys should not exceed a long-term working temperature of 250°C. However, one of the major drawbacks of other metals and alloys is that, as the mechanical properties fall with temperature, their strength rises, while elongation and toughness fall, which means that they become brittle. However, aluminium and aluminium alloys are not, their mechanical properties are, with the temperature drop, and the overall rising, which makes them a very good manufacturing of low temperature equipment of the wonderful materials, such as liquefied cryogenic natural gas ship (LNG) of the NOAA container, oxygen machine parts, rocket fuel (liquid oxygen, liquid hydrogen) storage tank.