当前位置: X-MOL 学术Metals › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Interstitials in f.c.c. High Entropy Alloys
Metals ( IF 2.9 ) Pub Date : 2020-05-25 , DOI: 10.3390/met10050695
Ian Baker

The effects of interstitials on the mechanical properties of single-phase f.c.c. high entropy alloys (HEAs) have been assessed based on a review of the literature. It is found that in nearly all studies, carbon increases the yield strength, in some cases by more than in traditional alloys. This suggests that carbon can be an excellent way to strengthen HEAs. This strength increase is related to the lattice expansion from the carbon. The effects on other mechanical behavior is mixed. Most studies show a slight reduction in ductility due to carbon, but a few show increases in ductility accompanying the yield strength increase. Similarly, some studies show little or modest increases in work-hardening rate (WHR) due to carbon, whereas a few show a substantial increase. These latter effects are due to changes in deformation mode. For both undoped and carbon doped CoCrFeMnNi, the room temperature ductility decreases slightly with decreasing grain size until ~2–5 µm, below which the ductility appears to decrease rapidly. The room temperature WHR also appears to decrease with decreasing grain size in both undoped and carbon-doped CoCrFeMnNi and in nitrogen-doped medium entropy alloy NiCoCr, and, at least for the undoped HEA, shows a sharp decrease at grain sizes <2 µm. Interestingly, carbon has been shown to almost double the Hall–Petch strengthening in CoCrFeMnNi, suggesting the segregation of carbon to the grain boundaries. There have been few studies on the effects of other interstitials such as boron, nitrogen and hydrogen. It is clear that more research is needed on interstitials both to understand their effects on mechanical properties and to optimize their use.

中文翻译:

FCC高熵合金中的间隙

基于文献综述,已经评估了间隙对单相fcc高熵合金(HEA)力学性能的影响。发现几乎在所有研究中,碳都提高了屈服强度,在某些情况下,碳的屈服强度比传统合金要大。这表明碳可以是增强HEA的绝佳方法。这种强度增加与碳的晶格膨胀有关。对其他机械性能的影响是混合的。大多数研究表明,由于碳的影响,延展性略有下降,但少数研究表明,随着屈服强度的增加,延展性增加。同样,一些研究表明,由于碳,加工硬化率(WHR)几乎没有或适度提高,而另一些研究却显示出大幅提高。后者的影响是由于变形模式的变化。对于未掺杂和碳掺杂的CoCrFeMnNi,室温延性会随着晶粒尺寸的减小而略有下降,直到〜2–5 µm,在此之下延展性似乎迅速降低。在未掺杂和碳掺杂的CoCrFeMnNi和氮掺杂的中熵合金NiCoCr中,室温WHR也会随着晶粒尺寸的减小而降低,并且至少对于未掺杂的HEA,在小于2 µm的晶粒上,室温WHR会急剧下降。有趣的是,已证明碳几乎是CoCrFeMnNi中Hall-Petch强化的两倍,表明碳偏析于晶界。很少有研究其他间隙材料如硼,氮和氢的影响。显然,需要对插页广告进行更多的研究,以了解插页广告对机械性能的影响并优化其使用。
更新日期:2020-05-25
down
wechat
bug