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Influence of Co addition on the deformation behavior and mechanical properties of Ni-16Cr-11Mo-2Cu alloy

机译：Co的添加对Ni-16Cr-11Mo-2Cu合金变形行为和力学性能的影响

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摘要

The roles of Co on the strain-hardening behavior, deformation mechanism, mechanical properties and facture mode of Ni-16Cr-11Mo-2Cu alloy were thoroughly investigated using tensile tests, SEM, EBSD, TEM and HRTEM. Two alloys with a similar sole FCC-gamma phase constitution, near grain size only except the composition difference of 30 wt% Co were fabricated in purpose. Co addition can overcome the strength-ductility trade-off by enhancing the strain-hardening rate and capacity. The deformation behavior evolves from slip-dominated to SFs-dominated after Co addition, due to significant decrease of stacking fault energy, the critical stresses for both SFs and twinning by Co addition. In terms of facture mode, dimples-dominated ductile fracture is transformed to quasi-cleavage fracture composed of cleavage planes and dimples after Co addition. This is probably owing to the special role of SFs on intensifying stress/strain incompatibility phenomenon in polycrystalline alloys.
机译：利用拉伸试验，SEM，EBSD，TEM和HRTEM深入研究了Co对Ni-16Cr-11Mo-2Cu合金的应变硬化行为，变形机理，力学性能和断裂模式的作用。特意制造了两种具有相似的唯一FCC-γ相组成的合金，仅晶粒尺寸接近，只是Co的成分差异为30％。共添加可以通过提高应变硬化速率和容量来克服强度-延性的折衷。添加堆叠后，由于堆垛层错能，SF的临界应力和添加Co的孪晶的显着降低，变形行为从滑移为主转变为SFs为主。就断裂方式而言，添加Co后，以酒窝为主的韧性断裂转变为由劈裂面和酒窝构成的准劈裂骨折。这可能是由于SF对增强多晶合金中的应力/应变不相容现象的特殊作用。

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