Scientists at Pohang University of Science and Technology (POSTECH) have made a major breakthrough in the field of materials science and developed a new nickel-based high-entropy alloy (HEA). The alloy can maintain its strength and flexibility at temperatures ranging from extremely cold -196°C to high temperatures of up to 600°C.

Scientists at Pohang University of Science and Technology (POSTECH) have made a major breakthrough in the field of materials science and developed a new nickel-based high-entropy alloy (HEA). The alloy can maintain its strength and flexibility at temperatures ranging from extremely cold -196°C to high temperatures of up to 600°C.

Simply put, the alloy is virtually inflexible, making it an ideal material for environments with extreme temperature changes. Professor Hyoung Seop Kim from multiple departments at Pohang University of Science and Technology (POSTECH) led the research. The research results were published in Materials Research Letters and attracted the attention of industries such as aerospace and automobiles.

Most metals fail when exposed to severe temperature changes. For example, metal objects feel cold in winter and hot in summer. This makes traditional metals less reliable where temperatures change rapidly or drastically. In order to solve this problem, the Pohang University of Science and Technology team introduced the concept of "Hyperadaptor" and developed this new alloy based on this.

High-entropy alloys (HEA) perform consistently across temperatures due to the presence of nanoscale L1₂ precipitates. These particles are evenly distributed throughout the alloy, increasing its strength by preventing deformation. At the same time, the alloy's structure adapts to stress, allowing it to remain reliable regardless of temperature.

Unlike ordinary alloys, which are usually made from one main element, high-entropy alloys (HEA) are made from a mixture of five or more elements in nearly equal amounts. This unique combination results in a highly random arrangement of atoms, known as high configurational entropy. This structure gives HEA superior qualities such as durability, flexibility, abrasion resistance and heat resistance. Due to these properties, HEAs are being widely used in demanding fields such as aerospace, automotive and nuclear industries.

The new alloy can be used in areas exposed to sudden temperature changes, such as engines, exhaust systems, turbines and pipes. Its ability to maintain strength and reliability under extreme conditions can improve safety and efficiency in these critical applications.

"Our HEA breaks through the limitations of existing alloys and creates a new class of temperature-insensitive materials," said Professor Kim. "The Hyperadaptor concept represents a breakthrough in developing next-generation materials that maintain stable mechanical behavior even under extreme conditions."

The discovery could help create better materials that work reliably in harsh environments and improve basic system performance.