论文标题
双重增厚的机制和旋转钢纳米温植物的弹性应变状态
The mechanism of twin thickening and the elastic strain state of TWIP steel nanotwins
论文作者
论文摘要
孪晶诱导的可塑性（TIP）钢，其名义组成为Fe-16.4mn-0.9C-0.5SI-0.0.05NB-0.05V，变形为6 \％的工程菌株。使用4D茎技术映射了变形双胞胎周围的应变。应变映射显示在平行和垂直于双向方向的方向上显示大约6 \％的平均弹性应变。但是，较大的平均应变由几个较大菌株的热点组成，最高为12 \％。这些热点可以归因于双边界上的高密度坦率脱位密度，并且对应于1--1.5 GPA的剪切应力。由于应变和应力场明显大于已知的Twin已知材料，并被推测是旋转钢纳米丝的早期厚度饱和的原因。保持双胞胎极度稀薄的能力有助于改善谷物的碎片化，\ textit {i.e。}动态霍尔奇效应，并支撑了twip钢中的较大伸长率和应变硬化速率。
A Twinning Induced Plasticity (TWIP) steel with a nominal composition of Fe-16.4Mn-0.9C-0.5Si-0.05Nb-0.05V was deformed to an engineering strain of 6\%. The strain around the deformation twins were mapped using the 4D-STEM technique. Strain mapping showed a large average elastic strain of approximately 6\% in the directions parallel and perpendicular to the twinning direction. However, the large average strain comprised of several hot spots of even larger strains of up to 12\%. These hot spots could be attributed to a high density of sessile Frank dislocations on the twin boundary and correspond to shear stresses of 1--1.5 GPa. The strain and therefore stress fields are significantly larger than other materials known to twin and are speculated to be responsible for the early thickness saturation of TWIP steel nanotwins. The ability to keep twins extremely thin helps improve grain fragmentation, \textit{i.e.} the dynamic Hall-Petch effect, and underpins the large elongations and strain hardening rates in TWIP steels.
