陈昊 王翠菊 曹芳芳 张羽 邓坤坤. 基于Ti微片调控下Mg-5Zn-0.5Ca合金的显微组织与力学性能[J]. 金属学报, DOI: 10.11900/0412.1961.2025.00051.

摘要 相关文章 Metrics 全文: PDF(3531 KB)   摘要: 为探明片状增强体对镁基复合材料的调控机制，研究不同形态可变形金属颗粒增强镁基复合材料的可行性，本工作深入探究了Ti微片(Tims)片化程度对Tims/ZX50显微组织、力学性能、加工硬化与软化行为的影响。采用球磨工艺对Ti颗粒(Tip)进行片化处理，并基于该工艺调控Tims的片化程度。通过半固态搅拌铸造方法将Tims引入Mg-5Zn-0.5Ca (ZX50)合金中，成功制备了Tims/ZX50复合材料，随后对其进行热挤压处理，研究Tims的片化程度对ZX50合金显微组织与力学性能的影响。结果表明，随Tims片化程度提升，其硬度显著增大。而在热挤压过程中，由于Tims对变形的协调作用，其硬度下降。Tims能够有效促进动态再结晶和动态析出，随片化程度的提升，ZX50基体再结晶晶粒尺寸减小，析出MgZn2相的数量增加。Tims对再结晶的影响呈现出方向性，与垂直于挤压方向相比，Tims/ZX50复合材料在平行于挤压方向的晶粒尺寸更小，且随Tims片化程度的增加，两方向的晶粒尺寸差值增大。此外，随Tims片化程度的增加，Tims/ZX50复合材料的强度、加工硬化率和软化速率均显示出上升的趋势，而软化率表现出先增加后减小的特征。当Tims径厚比增加到1.2时，伴随MgZn2相数量的增加，软化率逐渐降低。在载荷传递强化、位错强化、细晶强化的共同作用下，Tims/ZX50复合材料的强度逐渐增加。 关键词 ： Ti微片,  镁基复合材料,  力学性能,  加工硬化,  软化行为     Abstract：To enhance the mechanical properties of magnesium alloys and elucidate the regulatory mechanisms of flake-like structures in composites, while also exploring the feasibility of using deformable metallic particles with varying morphologies to reinforce magnesium matrix composites, this study systematically investigated the influence of deformable Ti microslices (Tims) with varying slicing degrees on the microstructure and properties of magnesium matrix composites. Ti particles were processed into sheets via ball milling process to control the slicing degree of the Tims. These Tims were introduced into an Mg–5Zn–0.5Ca (ZX50) alloy via semisolid stirring casting to successfully fabricate Tims/ZX50 composites. The composites subsequently underwent hot extrusion to examine the effect of Tims’ slicing degree on the microstructure and mechanical properties of the ZX50 alloy. The results indicate that the hardness of Tims increased significantly with higher slicing degrees but decreased markedly during the hot-extrusion process. Tims effectively regulated dynamic recrystallization and precipitation by altering the strain and load distribution within the matrix. As the slicing degree increased, the recrystallized grain size of the ZX50 matrix decreased, and the number of precipitated MgZn2 phases increased. The influence of Tims on recrystallization exhibited directionality, with finer grain sizes parallel to the extrusion direction than those perpendicular to it. Furthermore, the grain-size disparity grew with increasing Tims’ slicing degree. Additionally, the strength, work-hardening rate, and softening rate of Tims/ZX50 composites generally increased with increasing Tims slicing degrees, although the softening ratio initially increased and subsequently decreased. When the average aspect ratio of Tims reached 1.2, the softening rate progressively decreased as the quantity of MgZn2 phases increased. Under the synergistic effects of load-transfer, dislocation, and grain-refinement strengthening, the strength of the Tims/ZX50 composites gradually increased, with grain-refinement strengthening being the most significant contributor. Key words： Ti microslices    Magnesium matrix composite material    Mechanical properties    Work hardening    Softening behavior 收稿日期: 2025-02-27      ZTFLH:  TG379   基金资助:国家自然科学基金项目;国家自然科学基金项目;山西省自然科学基金项目;山西省自然科学基金项目;山西省重大科技专项计划项目 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 陈昊 王翠菊 曹芳芳 张羽 邓坤坤 44.8K 链接本文: https://www.ams.org.cn/CN/Y0/V/I/0 [1] 张天宇, 张鹏, 肖娜, 王小海, 刘国强, 杨志刚, 张弛. 奥氏体化温度对2 GPa超高强钢显微组织和力学性能的影响[J]. 金属学报, 2025, 61(9): 1353-1363. [2] 王洪瑛, 姚志浩, 李大禹, 郭婧, 姚凯俊, 董建新. 高 γ' 相含量粉末及变形高温合金组织和力学性能的异同性[J]. 金属学报, 2025, 61(9): 1364-1374. [3] 吴志勇, 邵徽凡, 蔡长春, 曾敏, 王振军, 王艳丽, 陈雷, 熊博文. 斜纹碳布缝合织物结构增强铝基复合材料的高温拉伸及断裂行为[J]. 金属学报, 2025, 61(9): 1387-1402. [4] 肖文龙, 臧晨阳, 郭锦涛, 冯佳文, 马朝利. 基于原位电阻法的7A65铝合金厚板双级时效工艺[J]. 金属学报, 2025, 61(8): 1153-1164. [5] 刘继浩, 迟宏宵, 武会宾, 马党参, 周健, 谷金波. 喷射成形工艺对M3高速钢碳化物特征及力学性能的影响[J]. 金属学报, 2025, 61(8): 1229-1244. [6] 蔡星周, 刘胜杰, 张禹森, 李小龙, 张宇鹤, 张文彬, 陈雷, 金淼. Mn偏析对0.3C-11Mn-2.7Al-1.8Si-Fe中锰钢力学性能的影响及作用机制[J]. 金属学报, 2025, 61(7): 1024-1034. [7] 谢昂, 陈胜虎, 姜海昌, 戎利建. Nb含量和均质化处理对奥氏体不锈钢铸态组织和力学性能的影响[J]. 金属学报, 2025, 61(7): 1035-1048. [8] 葛蓬华, 张勇, 李志明. 异构FeCoNi中熵合金的软磁与力学行为[J]. 金属学报, 2025, 61(7): 1119-1128. [9] 钦兰云, 张健, 伊俊振, 崔岩峰, 杨光, 王超. 固溶时效对激光沉积修复ZM6合金组织及力学性能的影响[J]. 金属学报, 2025, 61(6): 875-886. [10] 李夫顺, 刘志鹏, 丁灿灿, 胡斌, 罗海文. 一种新型高强奥氏体低密度钢的强塑性机理[J]. 金属学报, 2025, 61(6): 909-916. [11] 雷云龙, 杨康, 辛越, 姜自滔, 童宝宏, 张世宏. 机械合金化AlCrCu0.5Mo0.5Ni高熵合金及其后续退火态的结构演化[J]. 金属学报, 2025, 61(5): 731-743. [12] 孟祥龙, 刘瑞良, Li D. Y.. 钽合金表面渗碳层中碳化物析出及其性能的第一性原理研究[J]. 金属学报, 2025, 61(5): 797-808. [13] 孙军, 刘刚, 杨冲, 张鹏, 薛航. 耐热铝合金：组织设计与合金制备[J]. 金属学报, 2025, 61(4): 521-525. [14] 杨明辉, 李星吾, 孙崇昊, 阮莹. 定向凝固与固态相变双联协控下Monel K-500合金的组织和力学性能[J]. 金属学报, 2025, 61(4): 561-571. [15] 蔡正清, 尹大伟, 杨靓, 王文祥, 王飞龙, 温永清, 马明臻. Ag替换Cu对Zr-Ti-Cu-Al非晶合金性能的影响[J]. 金属学报, 2025, 61(4): 572-582. Viewed Full text Abstract Cited   Shared      Discussed