GRAIN GROWTH FOLLOWING RECRYSTALLIZATION

Chapter 11 GRAIN GROWTH FOLLOWING RECRYSTALLIZATION 11.1 INTRODUCTION Compared with primary recrystallization, the growth of grains in a recrystallized single- phase material might appear to be a relatively simple process. However, despite a large amount of theoretical and experimental effort, many important questions remain unanswered. The theoretical basis for understanding grain growth was laid down over 50 years ago in the classic papers of Smith (1948, 1952) and Burke and Turnbull (1952), and the apparent conflict of theory with experiment prompted several other theoretical models over a period of some 30 years. The application of computer simulation techniques (Anderson et al. 1984) provided a fresh approach to the problem and the interest and controversy surrounding the computer simulations gave a stimulus to the subject, which resulted in a number of international conferences (§1.2.2) and a large volume of literature. Although primary recrystallization often precedes grain growth, it is of course not a necessary precursor, and the contents of this chapter are equally relevant to grain growth in materials produced by other routes, such as casting or vapour deposition. In this chapter we consider only the growth of grains under the driving pressures due to boundaries in the material. However, we note here that boundaries can be induced to 333

GRAIN GROWTH FOLLOWING RECRYSTALLIZATION

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