Abstract—

The β \( \rightleftarrows \) α phase transformations in foil of the Pd–52 at % Cu solid solution prepared by rolling have been studied using X-ray diffractometry and resistivity measurements during thermal heating–cooling cycles or lamp processing (LP) using light from high-power pulsed xenon lamps, followed by cooling. The results demonstrate that complete ordering of the two-phase (α + β) as-prepared (as-rolled) foil follows the sequence (α + β) → β → α → β in the first heating–cooling cycle and β → α → β in the second and subsequent cycles. When a radiative energy critical for a given thickness of foil with an ordered structure is delivered to the foil surface, an irreversible β → α phase transformation occurs, whose rate can be three orders of magnitude higher than the rate characteristic of the disordering process during Joule heating. After LP, the reversibility of the β \( \rightleftarrows \) α phase transformations, inherent in the initial, ordered structure, is observed in a second thermal cycle: heating to 700°C and cooling. The sequence of phase transitions is α → β → α → β in the first cycle and β → α → β in the second and subsequent cycles. The localization of light in the skin layer and finite thermal conductivity offer the possibility of producing a structure with a phase composition gradient at subcritical irradiation times. The fact that the LP-stabilized α-phase persists up to 300°C makes it possible to compare the mechanical properties of foil samples having identical elemental compositions but different (ordered and disordered) structures.

中文翻译：

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闪光灯处理激活的Pd-Cu固溶体箔中的结构转变

摘要-

β \（\ rightleftarrows \）在热加热-冷却循环或使用高功率脉冲氙气灯的灯加工（LP）期间，使用X射线衍射仪和电阻率测量研究了通过轧制制备的Pd–52 at％Cu固溶体箔中的α相变。 ，然后冷却。结果表明，在第一个加热-冷却循环中，准备好的（轧制的）两相（α+β）箔的完全排序遵循顺序（α+β）→β→α→β →在第二个及随后的循环中β。当将对于给定厚度的具有规则结构的箔至关重要的辐射能传递到箔表面时，发生不可逆的β→α相变，其速率可能比焦耳无序过程的速率特性高三个数量级。加热。LP之后\（\ rightleftarrows \） α相变，在初始，有序结构所固有的，在第二次热循环，观察到：加热至700℃并冷却。相变的顺序在第一个循环中为α→β→α→β，在第二个及随后的循环中为β→α→β。光在皮肤层中的定位和有限的热导率提供了在亚临界辐照时间下产生具有相组成梯度的结构的可能性。LP稳定的α相持续到300°C的事实使得可以比较具有相同元素组成但结构（有序和无序）的箔样品的机械性能。