Metallurgy, superconductivity, and hardness of a new high-entropy alloy superconductor Ti-Hf-Nb-Ta-Re oleh Takuma Hattori, Yuto Watanabe, Terukazu Nishizaki, Koki Hiraoka, Masato Kakihara, Kazuhisa Hoshi, Yoshikazu Mizuguchi, Jiro Kitagawa