Recrystallization texture

Selenium is added up to 0.1% to silicon steels (2—4% Si) used in transformer cores to enhance the development of the secondary recrystallization texture which, in turn, improves the magnetic characteristics. Selenium alloying additions to the melt may be made as elemental Se, nickel—selenium, or ferroselenium. The recovery depends on the melting practice and method of addition. Normally, it is in the range of 66%, but may be as high as 90%. 

Recrystallization texture is also common for chalcopyrite and sphalerite. The occurrence of chalcopyrite and sphalerite filling the interstices between the pyrite cubes and chalcopyrite inclusion within them is considered to be due to the recrystallization of pyritic ores containing chalcopyrite and sphalerite (Yui, 1983). Yui (1983) suggested that these textures found in the Besshi-type deposits are useful in interpreting ore textures of the Kuroko ores, particularly their diagenetic recrystallization features because such textures are commonly observed in the Kuroko ores (Yui, 1983 Eldridge et al., 1983). 

K. Liicke, The orientation dependence of grain boundary motion and the formation of recrystallization textures, Can. Met. Quart. 13 261 (1974). 

The acapulcoites (Fig. 6.7a) have recrystallized textures, but a few relict chondrules have been reported (McCoy et al., 1997a). The relative proportions of the minerals (olivine, orthopyroxene, diopside, plagioclase, metal) in acapulcoites are similar to those in ordinary chondrites, and the abundances of the major elements are nearly chondritic. However,... 

Winonaites have roughly chondritic mineralogy and chemical composition (Table 6), but achondritic, recrystallized textures (Eigures 16(c) and (d)). They are fine- to medium grained, mostly equigranular rocks but some (Pontlyfni and Mount Morris (Wisconsin)) contain what appear to be relic chondrules. Their mineral compositions are intermediate between those of enstatite and H chondrites, and EeNi-EeS veins that constitute the first partial melts of a chondritic precursor material are common (Benedix et al., 1998). 

Northwest Africa Oil (NWA 011) has briefly been described by Afanasiev et al. (2000) and more extensively by Yamaguchi et al. (2002), the source of most information presented here. NWA Oil is composed of relatively coarse, anhedral pigeonite and augite, and fine-grained, mostly interstitial plagioclase with a recrystallized texture, interpreted to indicate that it is a recrystallized breccia. Minor phases are silica, chromite, ilmenite, calcium phosphate, ferroan olivine, troilite, and baddeleyite. Pyroxenes make up... 

For information on deformation and recrystallization textures observed in specific materials in wire and sheet form, the reader should consult Barrett and Massalski [G.25] and Dillamore and Roberts [9.7], Here we are concerned only with the nature of textures and with their determination by x-ray methods. 

The notation hkl)[uvw specifies what is called an ideal orientation. Some metals and alloys have sheet textures so sharp that they can be adequately described by stating the ideal orientation to which the grains of the sheet closely conform. Most sheet textures, however, have so much scatter that they can be approximated symbolically only by the sum of a number of ideal orientations or texture components, and even such a description is inadequate. Thus, the deformation texture of brass sheet (70 Cu-30 Zn) is very near the ideal orientation (110)[Tl2]. But both the deformation and recrystallization textures of low-carbon sheet steel have so much scatter that the grain orientations present can be accurately represented only by a graphical description called a pole figure. 

In steels, moderate plastic deformation and low annealing temperature are beneficial in developing the recrystallization texture. Planar anisotropy increases with increasing deformation and higher annealing temperature in copper sheets, whereas the inverse is found in brass sheets [28]. 

Texture in a polycrystalline structure can arise in quite varied ways, e.g., deformation texture, casting texture, recrystallization texture, plate texture, or fiber texture. 

---