The newly developed Zr-1Nb-0.01Cu fuel cladding tubes were hydrogen-charged using the electrolytic technique and cooled down to room temperature after thermal treatment by furnace cooling (FC) and air cooling (AC). High energy X-ray diffraction and electron backscatter diffraction techniques were employed to measure the microscopic stress and crystallographic orientation of hydrides precipitated in FC and AC tube samples. The FC δ-hydrides precipitated in the Zr-1Nb-0.01Cu cladding tube were under an average compressive stress of about (-262.2 ± 20) MPa. While an average compressive stress of about (-152.4 ± 20) MPa was determined for the AC δ-hydrides precipitated in the Zr-1Nb-0.01Cu cladding tube. Nearly all the inter- and intra-granular δ-hydrides obtained during FC and AC followed the conventional (0001)_α-Zr ∥ (111)_δ-hydride orientation relationship (OR) with the α-Zr matrix. The unusual (0001)_α-Zr ∥ (100)_δ-hydride OR was only occasionally detected in the FC and AC intra-granular δ-hydrides. Interestingly, for the FC sample, δ-hydrides were simultaneously detected in an α-Zr grain, obeying (0001)_α-Zr ∥ (111)_δ-hydride OR and (0001)_α-Zr ∥ (100)_δ-hydride OR with the same parent α-Zr grain respectively.

使用电解技术对新开发的Zr-1Nb-0.01Cu燃料包层管充氢，并通过炉冷（FC）和空冷（AC）进行热处理后冷却至室温。高能X射线衍射和电子背散射衍射技术用于测量在FC和AC管样品中沉淀的氢化物的微观应力和晶体学取向。Zr-1Nb-0.01Cu熔覆管中析出的FCδ氢化物处于约（-262.2±20）MPa的平均压应力下。对于沉积在Zr-1Nb-0.01Cu覆层管中的ACδ-氢化物，确定的平均压应力约为（-152.4±20）MPa。在FC和AC过程中获得的几乎所有晶间和晶内δ-氢化物都遵循常规的（0001）_α-Zr ∥（111）_δ-氢化取向关系（OR）与α-Zr的矩阵。仅在FC和AC颗粒内δ-氢化物中偶然发现异常的（0001）_α- Zr∥（100）_δ-氢化物OR。有趣的是，对于FC样品，同时遵循（0001）_α- Zr∥（111）_δ-氢化物OR和（0001）_α- Zr∥（100）_δ-氢化物OR的同时在α-Zr晶粒中检测到_{δ-氢化物。}分别具有相同的母α-Zr晶粒。