Metallic glasses, sometimes referred to as bulk metallic glasses (or BMGs for short), are metallic alloys with a non-crystalline structure. BMGs are made of various metals, including iron, nickel, zinc, and magnesium, and typically contain a combination of several elements. BMGs were introduced during 1970s and have since become widely used in aerospace, biomedical, and electronics industries.

These metallic glasses have several unique properties compared to traditional crystalline metals. The most notable difference is their lack of a recognizable crystal structure. Instead of having a crystalline lattice, BMGs are composed of atoms that are randomly arranged in an amorphous state. This lack of order results in a very high resistance to wear and corrosion. Furthermore, BMGs have very high strength-to-weight ratios, meaning that they are much lighter than crystalline metals yet retain a large amount of strength.

Because BMGs have a non-crystalline structure, they have a high degree of flexibility. They have a small yield point, meaning they can be easily deformed and manipulated while still retaining their shape and properties. This makes them well-suited for applications that require flexibility, such as automotive parts, medical implants, and electronics components.

In addition to their flexibility, BMGs also have a very low coefficient of thermal expansion. This means that BMGs can be used in applications where materials need to resist changes in shape due to changes in temperature without breaking or cracking. This makes them a perfect choice for components that are used in extreme temperatures and/or environments.

BMGs also have excellent electrical and thermal conductivity, making them well-suited for electronic components, such as motors and printed circuits. Additionally, because of their lack of a crystalline structure, BMGs can be manufactured in thin films with less machinery and in a cost-effective manner. This makes them a great choice for extremely small parts and intricate products.

Overall, bulk metallic glasses are an excellent choice for a variety of applications. Their lack of a crystalline structure, high strength-to-weight ratio, flexibility, low coefficient of thermal expansion, and excellent electrical and thermal conductivity make them a great fit for a variety of industries, including aerospace, biomedical, and electronics. Therefore, those looking for a high-performance, cost-effective material should consider BMGs as a potential option.