| 释义 |
superˈplastic, a. and n. Metallurgy.
[super- 9 a, 10: see superplasticity.]
A. adj. Of, pertaining to, or designating a metal capable of extreme plastic extension under load; involving or characteristic of such materials.
1947Chem. Abstr. XLI. 2375 The superplastic alloy cannot be a mixt. of solid solns. of Al and Zn. 1970New Scientist 12 Mar. 504/2 One of the most suitable titanium alloys—Ti-318—is superplastic at 930°C if correctly worked, and can be made to stretch and flow like plastic. 1978Jrnl. R. Soc. Arts CXXVI. 689/1 It is possible that the single heat cycle combination of superplastic forming and diffusion bonding will revolutionize the fabrication of titanium sheet structures for aircraft applications. 1978Nature 16 Nov. 209/2 The consolidated product can have very fine grain sizes which in turn leads to great ductility at ambient temperature—even to superplastic behaviour.
B. n. A superplastic metal.
1969New Scientist 2 Jan. 22/2 This metal, after treatment which reduces the grain size to about a micrometre, behaves like a superplastic at room temperature—it can be stretched by a factor of about 10 in one direction without breaking. 1971Britannica Yearbk. Sci. & Future 1972 406 While the superplastics are only starting to shed their image as laboratory curiosities, the fiber composites have almost arrived.
Hence superˈplastically adv.; ˌsuperplaˈsticity [tr. Russ. sverkhplastichnost´ (Bochvar & Sviderskaya 1945, in Izvestiya Akad. Nauk SSSR: Otdelenie tekhnicheskikh Nauk ix. 824)], the state or quality of being superplastic.
1947Chem. Abstr. XLI. 2375 (heading) Superplasticity in zinc-aluminum alloys. 1969Sci. Jrnl. June 75/2 At one time, it was considered that superplastic metallic alloys were amorphous-like and for this reason behaved superplastically. 1977Jrnl. R. Soc. Arts CXXV. 348/1 The exploitation of superplasticity in titanium sheet opens the way for shaped components of reduced cost. 1978Ibid. CXXVI. 688/1 When the temperature of the blank reaches 950°C the argon pressure is increased at a programmed rate to expand the blank into the tool superplastically. |
