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Gum metal, also called TNTZ, is a unique titanium alloy with high elasticity, ductility, and yield strength. While originally developed with a composition of 23% niobium, 0.7% tantalum, 2% zirconium, and 1% oxygen, it can exist over a range of compositions and also include vanadium and hafnium.〔 〕〔 〕 Applying cold work to gum metal actually decreases its elastic modulus,〔 with reported shear moduli as low as .〔 〕 At the same time, cold work increases gum metal's yield strength.〔 By using a heat treatment after this cold work, some elasticity can be sacrificed for even greater strength, with yield strengths ranging as high as , on par with some of the strongest steels.〔 "Gum metal" is a registered trademark of Toyota Central R&D Labs and was initially developed there. The results of that research were first published in April 2003.〔 == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gum metal」の詳細全文を読む スポンサード リンク
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