Hall-Petch relationship in Mg alloys: A review

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2018,（2）
• 页码范围: 248-256
• 页数: 9页
• 语种: 英文

摘要

Grain refinement could effectively enhance yield strength of Mg alloys according to the well-known Hall-Petch theory.For decades,many studies have been devoted to the factors influencing the HallPetch slope (k) in Mg alloys.Understanding the factors influencing k and their mechanisms could offer guidance to design and produce high-strength Mg alloys through effective grain refinement hardening.A review and comments of the past work on the factors influencing k in Mg alloys are presented.Results of these previous investigations demonstrate that the value of k in Mg alloys varies with texture,grain size,temperature and stain.The influence of texture and grain size on k is found to be an essential result of the variation of deformation mode on k value.Without the variation of deformation modes,it is revealed that texture could also impose a significant effect on k and this is also summarized and discussed in this paper.The reason for texture effect on k is analyzed based on the mechanism of Hall-Petch relationship.In addition,it is found in face-centered cubic (fcc) or body-centered cubic (bcc) metals that boundary parameters (boundary coherence,boundary energy and boundary diffusivity) could strengthen twinning or slips to a different extent.Therefore,the role of boundary parameters is also extended into the k values in Mg alloys and discussed in this paper.In the end,we discuss the future research perspective of Hall-Petch relationship in Mg alloys.