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Tensile property and deformation behavior of a directionally solidified Ni-base superalloy

机译：定向凝固Ni基高温合金的拉伸性能和变形行为

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Tensile behavior of directionally solidified Ni-base superalloy DZ951 was studied in the temperature range of 20-1100 ℃. Extensive TEM investigations were performed after tensile test to fracture. The yield and tensile strengths initially decrease slightly with temperature and reach minima at around 700 ℃ With further increase in temperature, the yield and tensile strengths increase to maxima at about 760 ℃ and then decrease sharply. In contrast to changes in strength with temperature, elongation is without significant change from 20 to 700 ℃ and then decreases to a minimum at 760 ℃. Beyond that point an increase in elongation with respect to temperature occurs. The intermediate temperature brit-tleness behavior for DZ951 alloy is remarkable. The deformation microstructures could be classified in three regimes. At low temperatures, the deformation was dominated by γ' shearing by pairs of a/2(110) dislocations. At high temperatures, the deformation was dominated by γ' by-pass. Intermediate temperatures exhibited transitional behavior. The ductility minimum at 760 ℃ is due to strain localization mainly caused by stacking faults.
机译：研究了定向凝固Ni基高温合金DZ951在20-1100℃温度范围内的拉伸行为。拉伸试验断裂后进行了广泛的TEM研究。屈服强度和抗拉强度最初随温度略有下降，并在700℃左右达到最小值。随着温度的进一步升高，屈服强度和抗拉强度在约760℃时达到最大值，然后急剧下降。与强度随温度的变化相反，从20到700℃的伸长率没有明显变化，但在760℃时伸长率降至最低。超过该点，相对于温度的伸长率发生增加。 DZ951合金的中间温度刚度行为很明显。变形微观结构可以分为三种状态。在低温下，变形以成对的a / 2（110）位错的γ'剪切为主。在高温下，变形以γ'旁路为主。中间温度表现出过渡行为。 760℃下的最小延展性是由于应变局部化而引起的，该局部化主要是由堆垛层错引起的。

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