The GH3536 (Hastelloy X) superalloy is one of the most widely used Ni-based sheet alloys for gas turbine hot parts. To investigate its relationship among the processing, microstructure, and mechanical properties, GH3536 alloy was fabricated from pure constituent elements by arc melting and drop casting. The drop-cast ingots were homogenized, cold rolled, and recrystallized to obtain single-phase microstructure with average grain size of ∼12 μm. Tensile tests were then performed at a wide temperature range between 77 K and 1,073 K. Surprisingly, although this alloy was developed for high temperature use, it has extraordinary cryogenic mechanical properties. Moreover, the yield strength, ultimate tensile strength, and elongation to fracture increased dramatically with decreasing temperature, exactly the same behavior as that of recently developed face-centered cubic medium/high-entropy alloys (M/HEAs). Transmission electron microscopy was used to study the deformation mechanisms of GH3536 alloy at 77 K and room temperature. Deformation-induced nano-twins were observed after interrupted/fracture tests at 77 K, but rarely in specimens tested at room temperature, where plasticity occurred exclusively by dislocation gliding. The similarity between this 70-year-old GH3536 (Hastelloy X) alloy and M/HEAs, which is recently considered as the revolution in alloy design, will be discussed from the viewpoint of the microstructure, entropy calculation, mechanical properties, and deformation mechanism.

GH3536（Hastelloy X）超级合金是用于燃气轮机热零件的最广泛使用的镍基薄板合金之一。为了研究其在工艺，微观组织和力学性能之间的关系，GH3536合金是通过电弧熔化和滴铸法由纯组成元素制成的。将滴铸的锭均质，冷轧并重结晶，以获得平均晶粒尺寸约为12μm的单相显微组织。然后在77 K至1,073 K的较宽温度范围内进行了拉伸试验。令人惊讶的是，尽管该合金是为高温使用而开发的，但它具有出色的低温机械性能。此外，屈服强度，极限抗拉强度和断裂伸长率随温度降低而急剧增加，行为与最近开发的面心立方中/高熵合金（M / HEAs）完全相同。用透射电子显微镜研究了GH3536合金在77 K和室温下的变形机理。在77 K的中断/断裂测试后，观察到了变形诱导的纳米孪晶，但在室温下测试的样品中很少见，其中可塑性仅通过位错滑动而发生。从微观结构，熵计算，力学性能和变形机理的角度讨论了这种具有70​​年历史的GH3536（Hastelloy X）合金与最近被认为是合金设计革命的M / HEA之间的相似性。 。用透射电子显微镜研究了GH3536合金在77 K和室温下的变形机理。在77 K的中断/断裂测试后，观察到了变形诱导的纳米孪晶，但在室温下测试的样品中很少见，其中可塑性仅通过位错滑动而发生。从微观结构，熵计算，力学性能和变形机理的角度讨论了这种具有70​​年历史的GH3536（Hastelloy X）合金与最近被认为是合金设计革命的M / HEA之间的相似性。 。用透射电子显微镜研究了GH3536合金在77 K和室温下的变形机理。在77 K的中断/断裂测试后，观察到了变形诱导的纳米孪晶，但在室温下测试的样品中很少见，其中可塑性仅通过位错滑动而发生。从微观结构，熵计算，力学性能和变形机理的角度讨论了这种具有70​​年历史的GH3536（Hastelloy X）合金与最近被认为是合金设计革命的M / HEA之间的相似性。 。