对添加微量Sb元素的4XXX系列铝合金的铸造、挤压及锻造显微组织进行了观察. 结果表明: 铸造状态下的树枝状组织在挤压预热过程中形成了带有方向性的小结晶, 之后再成长为显微结晶, 观察到了变化为球状的结晶粒. 锻造后, α相基体中除了共晶组成(11%～12.6%Si)外, 还存在多角形初晶Si和Al4Cu 9相. 正是这些相的存在, 提高了合金的高温强度. 在凝固过程中, 由于Mg的部分偏析, 认为能析出Mg2Si, 有助于提高材料的耐热性能, 并判断Al4Cu9相起维持高温强度的重要作用. 用该材料制造的汽车连杆的平均硬度为Hv133, 大体上能够满足实际需要(Hv13 7). 随着锻造温度的增加, 变形抗力和加工应力减小, 合金的成形性能得到提高.
参考文献
| [1] | Hung-Suk Ko;Suk-Bong Kang .Effect of intermediate annealing on the texture evolution in Al-6wt%Mg for automobile body sheets application[J].Journal of Korean Institute of Metal and Materials,1999(8):891-897. |
| [2] | Kim C J;Jung J Y .View and evolution conditions of Al alloys on air plane[J].Machine and Materials,1990,2(04):48-49. |
| [3] | Kaneko Y;Murakami H;Kuroda K 等.[J].Foundry Trade Journal,1980,2:379-397. |
| [4] | Ho In Lee .Aluminum engine materials for automobile[J].Journal of the Korean Institute of Metals and Materials,1991,4(03):227-239. |
| [5] | Tsuda;Cegawa .Effect of strontium and phosphorus on solid/liquid int erface of Al-Si eutectic[J].Journal of Japanese Foundry Engineering Society(in Japanese),1971,43(09):92-95. |
| [6] | Sekiguchi T .Forging of aluminum alloys[J].Japanese Journal of Institute of Light Metals(Japan),1994,44(12):742-758. |
| [7] | Lim C Y;Umezawa O;Nagai K .Influence of low temperature working on microstructure and mechanical properties of Al-7Si-(Fe) alloys[J].Metals and Materials,1998,4(05):1027-1031. |
| [8] | LEE H K;Cho K;Park I M et al.Wear properties of high temperature Al alloys[J].Journal of the Korean Institute of Metals and Materials,1995,33(02):243-246. |
| [9] | Shivanath R;Sengupta P K;Eyre T S.[J].Wear of Materials,1997 |
| [10] | JASIM K M;Dwarakadasa E S .Effect of mechanical properties on the adhesive wear of metals[J].Journal of Materials Science Letters,1992,11:1309-1311. |
| [11] | McQUEEN H J;Jonas J.6 Plastic deformation of material[J].Treatise on Materials Science and Technology,1975:333. |
| [12] | Sanker J;Mawkins D;Mcqueen J J .Influence of caluium on hot ductil ity of steels[J].Metals and Technology,1979,6:325-330. |
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%