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By Mel M Schwartz

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Among the alloys currently being considered as replacements for superalloys in hightemperature applications, some of the most promising are the intermetallic compounds in the Nb–Al system. The three compounds NbAl3, Nb2Al and Nb3Al have melting temperatures in excess of many candidate replacement materials and densities that are superior to or competitive with those materials. Furthermore, the crystal structures, although complex, are reasonably well understood. In addition to these physical properties, there is a distinct processing consideration that leads to heightened interest in this A TX66613_frame_A(1) Page 38 Wednesday, March 13, 2002 11:12 AM A system.

The compound RCo5, where R is samarium (Sm), lanthanum (La), cerium (Ce), and so on, has extremely high coercivity. Precious-Metal Alloys In addition to their use in coins and jewelry, precious metals such as silver, gold, and the heavier platinum (Pt) metals are used extensively in electrical devices in which contact resistances must remain low, in catalytic applications to aid chemical reactions, and in temperature-measuring devices such as resistance thermometers and thermocouples. The unit of alloy impurity is commonly expressed in karats, © 2002 by CRC Press LLC when each karat is 1/24 part.

Upon reheating from T2 to T1, the shape change accomplished at T2 is recovered so that the object returns to its original configuration. This thermoelastic property of the shape memory alloys is associated with the fact that they undergo a martensitic phase transformation (that is, a reversible change in crystal structure that does not involve diffusion) when they are cooled or heated between T1 and T2. For a number of years the shape memory materials were essentially scientific curiosities. 5% cadmium.

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