摘要
以Al熔液为载体,采用原位反应生成形状规则、尺寸细小的TiB2颗粒相,再将TiB2颗粒传递到ZA27合金中,形成TiB2颗粒增强的ZA27复合材料。采用合理的熔炼工艺促进了TiB2颗粒在基体中的均匀分布。实验结果显示,TiB2颗粒在ZA27复合材料中,分布均匀,平均直径在3μm以下。TiB2颗粒的加入使得复合材料的晶粒明显细化,并随着TiB2颗粒含量增加,复合材料的抗拉强度、硬度明显提高,2.1%TiB2/ZA27复合材料与基体合金相比室温抗拉强度提高13%、布氏硬度提高21%,弹性模量也有所提高,在强度、硬度及弹性模量提高的同时,材料的塑性并未恶化,延伸率略有提高,另外,材料的热膨胀系数随着TiB2颗粒的加入有所降低。
In-situ TiB2 particles reinforced ZA27 composites were produced by two steps. As beginning, the reaction of creating TiB2 was processed in melting Al. After that, the second step, as a master alloy, TiB2/Al material was used to fabricate TiB2/ZA27 composites. It is found that the TiB2 particles whose size is less than 3 μm distribute in ZA27 matrix uniformly and the shape of them is equiaxed. The test results show that the tensile strength and hardness of the composites are enhanced observably following the refinement of matrix grain with the increase of TiB2 particles. For example, the tensile strength of the 2.1%TiB2/ZA27 composite is as high as 472 MPa when the hardness is 126 HB. The thermal expansion coefficient of 2.1%TiB2/ZA27 decreases compared with that of ZA27 alloy while the elastic modulus increases. At the same time, the ductility of the composites has not deteriorated and the elongation is also raised slightly.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2004年第4期87-91,共5页
Acta Materiae Compositae Sinica
关键词
原位反应
TIB2
ZA27复合材料
Aluminum alloys
Ductility
Elastic moduli
Hardness
Tensile strength
Zinc alloys
