As I know, there are several manufacturers and suppliers that provide High Entropy Alloy (HEA) in bulk form. Here are some options to consider:
Alfa Aesar: Alfa Aesar is a global supplier of high-purity metals, chemicals, and materials, including HEA alloys. They offer a wide range of HEA alloys, including CoCrFeMnNi, NiCoCrFeMn, and NiCoCrFeMoTi.
Materion: Materion is a leading supplier of advanced materials, including HEA alloys. They offer a range of HEA alloys, including AlCoCrFeNi, AlCoCrFeNi2, and AlCoCrFeNiNb.
Goodfellow: Goodfellow is a supplier of metals, ceramics, polymers, and other materials, including HEA alloys. They offer a range of HEA alloys, including AlCoCrFeNi, CoCrFeMnNi, and NiCoCrFeMoTi.
Ames Laboratory: Ames Laboratory is a U.S. Department of Energy national laboratory that specializes in materials science and engineering. They offer a range of HEA alloys, including AlCoCrFeNi, CoCrFeMnNi, and NiCoCrFeMoTi.
Haynes International: Haynes International is a manufacturer of high-performance alloys, including HEA alloys. They offer a range of HEA alloys, including CoCrFeMnNi and NiCoCrFeMoTi.
It's important to note that HEA alloys are still a relatively new class of materials, and their properties and applications are still being studied and developed. Therefore, the availability and specifications of HEA alloys may vary depending on the manufacturer or supplier. It's always best to consult with a professional or conduct testing to evaluate the suitability of a particular HEA alloy for your specific application.