研究了Al3Ti3B中间合金对AZ91D镁合金显微组织及力学性能的影响.通过光学显微镜和扫描电子显微镜观察发现,Al3Ti3B中间合金能显著减小AZ91D合金的二次枝晶臂间距与晶粒尺寸,在加入0.3%Al3Ti3B时晶粒尺寸就由原来的约260 μm减小至约100μm.伴随着合金晶粒尺寸的减小,合金的抗拉强度、屈服强度和延伸率都明显提高,这主要是由于晶粒细化后能阻碍裂纹扩展的有效晶界增多,晶界强化作用显著;同时,Al3Ti3B中间合金的加入促使溶质均匀分布,使共晶体(α+Mg17Al12)形貌发生改变,共晶体尺寸减小,这有利于裂纹切过脆性的共晶体传播,提高合金的变形协调能力.
参考文献
| [1] | Mordike B L;Ebert T .Magnesium: properties-applications-potential[J].Materials Science and Engineering A,2001,302(01):37-45. |
| [2] | Aghion E;Bronfin B.Magnesiun alloys development towords the 21st century[A].Aedermannsdorf Switzerland: Trans Tech Publications,2000:350-351:19-28. |
| [3] | Mukai T.;Watanabe H. .Grain Refinement of Commercial Magnesium Alloys for High-strain-rate-superplastic Forming[J].Materials Science Forum,2000(0):159-170. |
| [4] | Mamoru Mabuchi;Yasumasa Chino;Koji Shimojima .High Performance Mg Alloy by Grain Refinement[J].Materials Science Forum,2003(Pt.4):3299-3304. |
| [5] | Jaschik C;Hafekamp H;Niemeyer M.New magnesium wrought alloys[M].Chichester: Wiley-VCH,2000:41-46. |
| [6] | 余琨,黎文献,王日初,马正青.变形镁合金的研究、开发及应用[J].中国有色金属学报,2003(02):277-288. |
| [7] | Lee Y C;Dahle A K;StJohn D H.Grain refinement of magnesium[A].Pennsylvania:TMS,2000:211-217. |
| [8] | Yano E;Tamura Y;Motegi T et al.Effect of carbon powder on grain refinement of an AZ91E magnesium alloy[J].Japanese Journal of Institute of Light Metals(Japan),2001,51(11):599-603. |
| [9] | Makoto T;Suzuki T;Fukui I et al.Effect of Ti or Ti-B on grain size and mechanical properties of Al-70%Si-0.3 %Mg casting alloy[J].Japanese Journal of Institute of Light Metals(Japan),1979,29(10):437-444. |
| [10] | Sasaki H;Adachi M;Sato S et al.Effect of solidified microstructures on mechanical properties of AZ91magnesium alloy[J].Japanese Journal of Institute of Light Metals(Japan),1997,47(03):133-138. |
| [11] | Haitani T;Tamura Y;Yano E et al.Grain refining mechanism of high-purity Mg-9% Al alloy ingot and influence of Fe or Mn addition on cast grain size[J].Japanese Journal of Institute of Light Metals(Japan),2001,51(08):403-408. |
| [12] | 柳延辉,刘相法,李廷斌,边秀房,张均艳.Al-Ti-C中间合金对Mg-Al合金的晶粒细化作用[J].中国有色金属学报,2003(03):622-625. |
| [13] | 张世军,黎文献,余琨.添加含碳熔剂细化镁合金晶粒的方法[J].特种铸造及有色合金,2002(04):18-19. |
| [14] | Qinglin Jin;Jeong-Pil Eom;Su-Gun Lim;Won-Wook Park;Bong-Sun You .Grain refining mechanism of a carbon addition method in a Mg-Al magnesium alloy[J].Scripta materialia,2003(11):1129-1132. |
| [15] | Tamura Y;Kono N;Motegi T et al.Grain refinement of cast Mg-Al alloys[J].Japanese Journal of Institute of Light Metals(Japan),1998,48(08):395-399. |
| [16] | 高守雷,翟启杰,戚飞鹏,富知愚,龚永勇.超声波在金属凝固中的应用与发展[J].材料导报,2002(09):5-6,32. |
| [17] | A. Maltais;M. Fiset;D. Dube .Grain Refinement of Magnesium Alloy AZ91D Cast in Permanent Mold Using Mechanical Vibrations[J].Materials Science Forum,2003(Pt.1):527-532. |
| [18] | Matagi T;Sato E;Obata K .Cast structures and grain refinement of superheat-treated Mg-Al alloy[J].Japanese Journal of Institute of Light Metals(Japan),1994,44(08):427-432. |
| [19] | Nishino N;Kawahara H;Shimizu Y.Grain refinement of magnesium casting alloys by boron addition[A].Chichester: Wiley-VCH,2000:59-64. |
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%