采用铜模喷铸技术制备出AZ91D镁合金非平衡凝固试样,并对其热稳定性进行了研究.采用光学显微镜、扫描电镜、能谱分析仪及维氏显微硬度计对不同温度热处理镁合金的晶粒形貌、溶质含量及显微硬度变化进行对比研究.实验结果表明,当热处理温度200℃,保温时间240 min时,晶粒形貌未发生明显变化,但由于时效效应的存在,导致过饱和α-Mg固溶体中沉淀相析出,Al元素溶质含量有所下降,合金显微硬度略有升高.相同保温时间条件下,随热处理温度升高,3-Mg17 Al12共晶相体积分数不断降低,固溶到基体中导致Al元素含量增加.与此同时,初生α-Mg相晶界逐渐清晰并发生明显的晶粒长大现象,合金显微硬度呈整体下降趋势.
参考文献
[1] | K. Kubota;M. Mabuchi .Review Processing and mechanical properties of fine-grained magnesium alloys[J].Journal of Materials Science,1999(10):0-0. |
[2] | Mordike B L;Ebert T .Magnesium properties-application-potential[J].Materials Science and Engineering A,2001,302(01):37-45. |
[3] | 邱克强,郭强,热焱,尤俊华,任英磊,李荣德.热处理对挤压态Mg-5Sn-2Si-2Sr合金组织及性能的影响[J].材料热处理学报,2013(10):78-82. |
[4] | Wang RM.;Eliezer A.;Gutman E. .Microstructures and dislocations in the stressed AZ91D magnesium alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):279-287. |
[5] | 徐玉磊,张奎,李兴刚,雷健,袁海波.热处理对压铸AZ91D合金组织及硬度的影响[J].材料热处理学报,2012(11):63-67. |
[6] | 陈胜娜,蔡长春,余欢,杨伟,徐志锋,严青松.SiC含量对AZ91D镁合金细化效果及组织形貌的影响[J].特种铸造及有色合金,2013(10):976-979. |
[7] | 李正,吴圣川,徐道荣,王文先.激光熔修AZ31B镁合金焊趾区材料的疲劳性能[J].失效分析与预防,2011(04):209-212. |
[8] | 程天一;张守华.快速凝固技术与新型合金[M].北京:宇航出版社,1990 |
[9] | Govind.;Mittal MC.;Lal K.;Mahanti RK.;Sivaramakrishnan CS.;Nair KS. .Development of rapidly solidified (RS) magnesium-aluminium-zinc alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(0):520-523. |
[10] | 宁向梅,黄金亮,殷镖,张兴渊.快速凝固Mg80Cu10Y10金属玻璃的晶化行为[J].材料热处理学报,2013(04):22-26. |
[11] | Maeng D.Y.;Kim T.S. .MICROSTRUCTURE AND STRENGTH OF RAPIDLY SOLIDIFIED AND EXTRUDED Mg-Zn ALLOYS[J].Scripta materialia,2000(5):358-389. |
[12] | J. Cai;G.C. Ma;Z. Liu .Influence of rapid solidification on the microstructure of AZ91HP alloy[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2006(1/2):92-96. |
[13] | Kawamuray Y;Havyashi K;Inoue A .Rapidly solidified powder metallurgy Mg97ZnlY2 alloys with excellent tensile yield strength above 600 MPa[J].Materials Transactions,2001,42(07):1172-1176. |
[14] | 丁培道,蒋斌,杨春楣,方亮.薄带连铸技术的发展现状与思考[J].中国有色金属学报,2004(z1):192-196. |
[15] | 张梅,朱世杰,陈贵林,张宝丰,关绍康.Mg7Zn3Y0.55Zr合金单辊条带显微组织的研究[J].铸造技术,2005(10):983-985. |
[16] | 黄正华,郭学锋,张忠明.快速凝固AZ91D镁合金组织的研究[J].材料热处理学报,2005(01):32-35. |
[17] | 徐春杰,张忠明,郭学锋,贾树卓,刘礼,孟令楠.热挤压AZ91D镁合金的组织与力学性能[J].西安理工大学学报,2005(04):356-360. |
[18] | 周涛 .快速凝固Mg-Zn系镁合金的组织与性能研究[D].湖南大学,2009. |
[19] | C.Y. Chen;C.Y.A. Tsao .Spray forming of silicon added AZ91 magnesium alloy and its workability[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(1):21-29. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%