研究时效处理对挤压态Mg-15Gd-3Y合金显微硬度及力学性能的影响,采用透射电镜对时效析出相的形态进行分析.结果表明:225 ℃、14 h时效时合金获得最高硬度,为135 HV,此时,晶内弥散析出许多纳米β′亚稳相,且与基体有着良好的共格匹配性,使合金获得较高强度和硬度,同时塑性降低;在225 ℃、70 h过时效作用下,纳米β′亚稳相原位长大成β稳定相,且与基体失去共格匹配性,降低合金的强度和硬度,同时塑性有所回升;合金的最高强度出现在200 ℃、100 h时效处,此时,抗拉强度达到446.67 MPa,合金中的β′亚稳相呈蠕虫状,沿亚晶界分布,有效地阻碍亚晶界和位错的运动,从而强化合金.
参考文献
| [1] | 刘正;张奎;曾小勤.镁基轻质合金理论基础及应用[M].北京:机械工业出版社,2002:1-2. |
| [2] | CERR E;BARBAGALLO S .The influence of high temperature on ageing kinetics of a die cast magnesium alloy[J].Materials Letters,2002,56(05):716-720. |
| [3] | 肖阳,张新明,陈健美,蒋浩,邓桢桢.高强耐热Mg-9Gd-4Y-0.6Zr合金的性能[J].中南大学学报（自然科学版）,2006(05):850-855. |
| [4] | Qiuming Peng;Xiuli Hou;Lidong Wang;Yaoming Wu;Zhanyi Cao;Limin Wang .Microstructure And Mechanical Properties Of High Performance Mg-gd Based Alloys[J].Materials & design,2009(2):292-296. |
| [5] | Z. Yang;J.P. Li;Y.C. Guo .Precipitation process and effect on mechanical properties of Mg-9Gd-3Y-0.6Zn-0.5Zr alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(0):274-280. |
| [6] | S.M. He;X.Q. Zeng;L.M. Peng .Precipitation in a Mg-10Gd-3Y-0.4Zr (wt. percent) alloy during isothermal ageing at 250 deg C[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2006(1/2):309-313. |
| [7] | 黄平 .Mg-12Gd-3Y-0.5Zr（wt.％）合金晶粒细化和时效研究[D].南京理工大学,2007. |
| [8] | 蒋浩 .Mg-Gd（Y）耐热镁合金材料及其热处理研究[D].中南大学,2006. |
| [9] | 陈部湘,张新明,邓运来,邓桢桢.时效对Mg-9Gd-4Y-0.6Zr挤压合金组织与性能的影响[J].湖南有色金属,2007(01):35-37. |
| [10] | YAO Su-juan;YI Dan-qing;YANG Sheng;LI Wang-xing .Aging characteristics and high temperature properties of Mg-9Gd-3Y-0.3Zr[J].Transactions of Nonferrous Metals Society of China,2007,17(01):418-422. |
| [11] | X. Gao;S.M. He;X.Q. Zeng;L.M. Peng;W.J. Ding;J.F. Nie .Microstructure evolution in a Mg-15Gd-0.5Zr (wt.%) alloy during isothermal aging at 250℃[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):322-327. |
| [12] | 崔忠圻.金属学与热处理[M].北京:机械工业出版社,2006:410. |
| [13] | ZHENG Kai-yun;DONG Jie;ZENG Xiao-qin;DING Wen-jiang.Aging Characteristics and mechanical properties of cast and wrought Mg-11Gd-2Nd-0.5Zr alloys[A].USA:TMS,2007:413-420. |
| [14] | 谢建昌,李全安,李建弘,张兴渊.时效时间对Mg-8Al-1Zn-3Ca合金组织及力学性能的影响[J].热加工工艺,2008(02):64-66,72. |
| [15] | 邹宏辉,曾小勤,翟春泉,丁文江.镁合金的强韧化进展[J].机械工程材料,2004(05):1-3,16. |
| [16] | L. Gao;R.S. Chen;E.H. Han .Effects of rare-earth elements Gd and Y on the solid solution strengthening of Mg alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2009(1/2):379-384. |
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%