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| 1 | 球化处理对AZ80镁合金析出相β-Mg_(17)Al_(12)及力学性能的影响显示文摘采用场发射扫描电镜(FESEM)、光镜(OM)、X射线衍射(XRD)、布氏硬度及拉伸实验等方法研究了球化处理对AZ80析出相β-Mg17Al12及力学性能的影响。结果表明:铸态AZ80合金经过415℃保温24 h随炉缓冷的退火处理后,晶间粗大的网状共晶β相消失,得到细小层片状脱溶β相均匀分布于α-Mg基体的平衡组织,且片层状间距致密。球化处理中,层片状β相以自身溶断方式实现球化;经300℃球化处理后镁基体上弥散分布大量细小颗粒状β相,继续升温,颗粒状β相发生二次固溶,数量减少。球化处理后合金的屈服强度、抗拉强度最大达135.4 MPa和258.7 MPa,较铸态合金分别提高了19.1%和59.6%,伸长率由铸态的4.96%上升至9.88%。布氏硬度HB随球化温度的升高呈现先增高后降低的变化规律,且均高于铸态合金。 | 张菊梅 王志虎 蔡辉 孙万昌 | 2015 | 材料热处理学报2015，36，8： | 7 |
| 2 | Influence of annealing and spheroidizing treatment on microstructure and mechanical properties of AZ91 magnesium alloy显示文摘The low-strength and high-brittleness of AZ91 cast magnesium alloy mainly result from the coarse divorced eutectic phase.To solve these problems,the annealing treatment of AZ91 cast magnesium alloy was carried out at 415 ℃ and held for 24 h in this study and the alloy was then slowly cooled to room temperature in furnace.The microstructures of the alloy were observed using a metallographic microscope,a transmission electron microscopy and an emission scanning electron microscopy,respectively.The phase analysis was performed using the X-ray diffraction,and the tensile test of the specimen at ambient temperature was performed on a material test machine.The results indicate that the coarse divorced eutectic phase dissolves into the Mg matrix during the isothermal process,and the lamellar β-Mg17Al12 phase precipitates from the magnesium solid solution with a type of pearlite precipitation during furnace cooling.Consequently,the spheroidizing treatment was carried out at 320 ℃ for 20 h following the annealing process and the lamellar β-Mg17Al12 phase was spheroidized.Compared with the as-cast alloy,the strength and ductility of the AZ91 magnesium alloy are increased obviously after annealing treatment;the yield strength and tensile strength are increased to 137.8 MPa and 240.4 MPa from 102.9 MPa and 199.3 MPa,respectively;and the elongation is improved to 6.12% from 4.35%.After being spheroidized,the strength and hardness decrease a little,but the ductility is elevated to 7.23%.The nucleation,growth and spheroidizing mechanism of the lamellar β-Mg17Al12 phase were also discussed. | Zhang Jumei Wang Zhihu Jiang Bailing Chen Zishan | 2013 | China Foundry2013，10，1： | 3 |
| 3 | 搅拌摩擦加工对Mg-2.67%Nd-0.5%Zn-0.5%Zr合金动态变形行为的影响显示文摘采用不同工艺对Mg-2.67%Nd-0.5%Zn-0.5%Zr合金进行了搅拌摩擦加工(FSP)处理,利用Hopkinson压杆对FSP处理前后的合金进行了冲击试验,探讨搅拌摩擦加工对该合金动态应力-应变行为及其应变率效应的影响。结果表明,FSP处理之后合金的显微组织因发生动态再结晶得到显著的细化,平均晶粒尺寸约由60μm减小至不足10μm。在高应变率冲击载荷下,合金母材的动态应力-应变行为表现出了明显的应变率强化效应,而FSP处理之后合金的动态应力-应变行为对应变率不敏感。这主要是由于经不同工艺FSP处理后,Mg-2.67%Nd-0.5%Zn-0.5%Zr合金产生的细晶强化及细小、弥散的沉淀相强化,大大提高了合金的变形抗力。 | 沙桂英 吕勤云 于涛 孙晓光 王洪顺 | 2010 | 航空材料学报2010，30，2： | 1 |
| 4 | 球化时间对AZ80镁合金组织及力学性能的影响显示文摘通过光学显微镜、场发射扫描电镜、X射线衍射(XRD)、硬度测试及拉伸试验等手段,研究了球化处理时间对AZ80析出相β-Mg17Al12及力学性能的影响。结果表明,铸态AZ80合金经退火处理后,晶间粗大的网状共晶β相消失,得到细小层片状脱溶β相均匀分布于α-Mg基体中。随球化时间延长,层片状β相开始溶断,先出现短棒状,然后向球状过渡,球化16h时镁基体上弥散分布大量细小颗粒状β相。继续延长时间,颗粒状β相出现溶解,数量减少,合金的综合性能最佳,屈服强度、抗拉强度和伸长率分别是132.5 MPa、252.4 MPa和9.56%。合金硬度随球化时间延长呈先升后降的变化规律,且均高于铸态合金。 | 张菊梅 王志虎 | 2015 | 特种铸造及有色合金2015，35，5： | 1 |
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