| 释义 |
recrystallization|ˌriːkrɪstəlaɪˈzeɪʃən|
[re- 5 a.]
1. The process of crystallizing again; spec. in Metallurgy, a rearrangement of the crystalline structure of a metal at high temperatures which tends to reduce distortion of the lattice.
1793Trans. Soc. Improv. Med. & Chirurg. Knowledge 30 (heading) A process for preparing pure emetic tartar by recrystallization. 1836–41Brande Chem. (ed. 5) 911 The crystals of chromate are..purified by recrystallization. 1881Daily News 7 Dec. 5/1 A breaking up and recrystallisation of..parties. 1925Jrnl. Iron & Steel Inst. CXII. 474 A formula is derived for establishing the relation between the progress of recrystallisation and the degree of deformation in the hot state. 1937Discovery Feb. 35/2 The firn consists of granular particles of ice..formed by recrystallisation of the snow. 1947J. C. Rich Materials & Methods Sculpture iv. 67 The setting of plaster of Paris after it has been mixed with water is also referred to as a rehydration and occasionally as a recrystallization of the calcined gypsum back to its original hydrated rock form. 1973B. J. Hazzard tr. Becker's Organicum ii. 38 The most important method for purifying solids is recrystallization. 1976M. C. Nutt Metallurgy & Plastics for Engineers v. 78 Recrystallization occurring at elevated temperatures is a process of the formation and growth of unrestrained grains, supplanting entirely the cold-worked structure.
2. Special Comb.: recrystallization temperature Metallurgy, the temperature at or above which recrystallization of the crystal lattice of a metal takes place (see quots.).
1927Carnegie Scholarship Mem. XVI. 166 No systematic investigation has been made..into the relation between the degree of cold-work and the recrystallisation temperature. 1948J. E. Garside in H. W. Baker Mod. Workshop Technology I. vi. 135 More precisely, cold working is defined as that process of deformation which is conducted below the recrystallization temperature of the metal or alloy. 1961G. E. Dieter Mech. Metallurgy v. 155 For practical considerations a recrystallization temperature can be defined as the temperature at which a given alloy in a highly cold-worked state completely recrystallizes in 1 hr. Ibid., The recrystallization temperature decreases with increasing purity of the metal. 1976M. C. Nutt Metallurgy & Plastics for Engineers v. 78 When a metal is heated, the internal force changes only slightly, but the movement of the atoms increases sharply. In time a temperature is reached at which movement of the atoms can start, and they can arrange themselves into lattices that are not distorted. This degree of heat is known as the recrystallization temperature. |