Superplastic micro-extrusion (SME) is a state-of-the-art micro-manufacturing technology that produces intricate shape miniaturized components. Magnesium and its alloys (Mg alloys) are potential contenders for the miniaturization industries due to their lightweight and biocompatibility properties. SME is a promising solution to overcome the room temperature ductility/formability concerns in Mg alloys. Therefore, for the first time, the current work proposes superplastic micro-extrusion technology to manufacture high-performance Mg-RE alloy (QE22) based micro-components. The desirable ultrafine grain (UFG) microstructure suitable for superplasticity is synthesized/engineered and further subjected to two modes of superplastic micro-deformation: (1) micro-forward extrusion (MFE) and (2) micro-backward extrusion (MBE) in pre-optimized extrusion conditions. The test results revealed a uniform hardness profile throughout the developed miniaturized micro-pin and micro-cup. Such homogeneous mechanical properties of the developed micro-components can be attributed to the microstructural engineering and high thermal stability of the developed material especially engineered for the current superplastic micro-extrusion processes. Microstructural analysis in all the conditions linked this distinctive characteristic to the activation of grain boundary sliding (GBS) and its accommodative micro-mechanisms. The physics and fundamental science of superplastic microforming in both micro-forward and micro-backward extrusion domain is established for the engineered Mg-RE alloy. Such investigations on understanding the fundamental mechanisms can address the existing challenges in micro-manufacturing industries.

中文翻译：

---

用于开发工程镁微型部件的超塑性微挤压技术。

超塑性微挤压（SME）是一种最先进的微制造技术，可生产形状复杂的微型部件。镁及其合金（镁合金）因其轻质和生物相容性而成为微型化行业的潜在竞争者。SME 是克服镁合金室温延展性/成形性问题的有前途的解决方案。因此，目前的工作首次提出超塑性微挤压技术来制造高性能镁稀土合金（QE22）基微型部件。合成/设计了适合超塑性的理想超细晶 (UFG) 微观结构，并进一步进行两种超塑性微变形模式：(1) 微前向挤压 (MFE) 和 (2) 预微后向挤压 (MBE) -优化的挤出条件。测试结果显示，所开发的微型微型销和微型杯具有均匀的硬度分布。所开发的微型部件的这种均匀机械性能可归因于所开发材料的微结构工程和高热稳定性，特别是针对当前超塑性微挤压工艺而设计的。所有条件下的微观结构分析将这一独特特征与晶界滑动（GBS）的激活及其调节微观机制联系起来。为工程镁稀土合金建立了微前向和微后向挤压领域超塑性微成形的物理和基础科学。这种了解基本机制的研究可以解决微制造行业现有的挑战。