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| 1 | 析出相粒子组态对Al-0.67Mg-1.35Si-0.64Cu-0.61Mn板材n值的影响显示文摘针对实验室制备的1.2 mm厚Al-0.67Mg-1.35Si-0.64Cu-0.61Mn冷轧薄板,通过合适的热处理使板材强度相当而析出相粒子的尺寸、数量和弥散度存在明显差异,研究析出相粒子的尺寸和弥散度与板材应变强化指数n的关系。结果表明:二次退火温度从400℃升高至550℃,Al-0.67Mg-1.35Si-0.64Cu-0.61Mn板材基体中Al_(1.9) CuMg_(4.1) Si_(3.3)粒子的尺寸逐渐增大而其弥散度逐渐降低,对铝板的析出强化作用逐渐减弱,因此铝板强度随二次退火温度升高而逐渐降低。运动位错以绕过方式通过微米级Al_(1.9) CuMg_(4.1) Si_(3.3)粒子的同时在粒子周围留下位错环,逐渐缩小了粒子的有效间距,使后续位错通过更困难,因此铝板在拉伸变形初期表现出明显的应变强化效应,当拉伸变形量为1%左右时,铝板的连续应变强化指数n_(c)值及阶段应变强化指数n_(s)值均最大。铝板的n_(c)值及n_(s)值均随微米级Al_(1.9) CuMg_(4.1) Si_(3.3)粒子尺寸增大及弥散度降低而逐渐增大。 | 刘玉杰 冯震 宋伟豪 王文泽 田妮 赵刚 | 2022 | 轻金属2022，，7： | 1 |
| 2 | 低密度镁锂合金性能强化与精密成形技术显示文摘针对轻质高强和近成形复杂结构的技术要求,提出一种基于低密度镁锂合金薄壁筒形件的等温超塑性双向挤压近净成形方法,研究了铸态成形性能、铸态和轧制态在不同温度下的力学性能变化规律。研究结果表明,铸态下延伸率约12%,抗拉强度约145 MPa,轧制态下延伸率变化不大,但抗拉强度提升到180 MPa以上。采用本论文方法镁锂合金的延伸率和抗拉强度显著提高,分别达到21%和216 MPa,表明高温大变形过程中,实现了晶粒细化,大量增强相弥散在晶粒内部,起到性能强化作用,成功实现其性能强化和复杂结构件的精密成形。 | 武练梅 易满满 李志亮 卢振 王长瑞 | 2023 | 宇航材料工艺2023，53，4： | 0 |
| 3 | Crimp feasibility of AZ31 magnesium alloy wide plate at warm temperatures responding to asymmetry显示文摘The crimp feasibility of AZ31 Mg alloy wide plate responding to asymmetry and anisotropy at different temperatures was conducted by bending experiments and numerical simulation.Through the microstructural characteristic,mechanical properties,EBSD and FEM analysis,the results indicated that{10-12}twins and pyramidal(a)slip were dominated at the inner surface layer of the plate,while prismatic and pyramidal(a)slips were controlled at the outer layer when bending at 100℃,and their quantity decreased as the temperature elevation and vanished at 200℃.The flexural deflection increased gradually with the augment of flexural temperature,while the fracture stress weakened.A large number of twins nucleated and grew in the coarse grain,causing major distribution proportion of high angular grain boundaries(HAGBs)at the compression part,which could improve its flexural properties and affect subsequent strain contours,twins and recrystallization distribution.The offset of the neutral layer declined from 1.4125 mm to 0.7261 mm with the temperature rising from 100℃to 250℃when bending,while it was concentrated on 0.0338-0.0481 mm when coiling,accounting for 0.26%-0.37%of the plate thickness.At last,the reel diameter descended with increasing the temperature and coiling rate. | Fangkun Ning Qichi Le Jiashi Yan Yonghui Jia | 2022 | Journal of Magnesium and Alloys2022，10，3： | 0 |
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