Thermal expansion of titanium

• Book ID: 104133405
• Publisher: Elsevier Science
• Year: 1943
• Tongue: English
• Weight: 53 KB
• Volume: 235
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(43)90633-7

✦ Synopsis

by adding ferro-manganese to 8 and 9 per cent. manganese alloys to observe the effect of increasing the iron content above the usual o.o4 per cent. which is present in the alloys made from electrolytic manganese. The presence of 0.35 per cent. or more of iron renders the silver-copper-manganese alloys ferromagnetic and these were, therefore, rejected by the machines. However, o.I5 per cent. of iron was found to be permissible, but to obtain this low value would require a low-iron manganese.

Finally, a change in the silver situation made it necessary to lower the silver content of the alloy because, otherwise, the 5-cent coin might actually have been worth more than this as metal. An alloy of 56 per cent. copper, 35 per cent. silver, and 9 per cent. manganese was selected by the Bureau of the Mint as a reasonable compromise, and this is now being used in coining 5-cent pieces. As a result, it is estimated that an additional 300 tons of nickel will be available annually for the production of war materials.