【摘要】：ZL114A合金具有優(yōu)良的力學性能和鑄造性能，適用于鑄造形狀復雜的高強度鑄件，被廣泛應用于航空、航天和軍事等工業(yè)。國內(nèi)生產(chǎn)的ZL114A合金與國外差異較大，有的不能滿足航空航天及性能要求較高的零件上，因而通過細化、變質(zhì)工藝提高ZL114A合金的力學性能具有重大的意義。 本文運用X-ray衍射儀、掃描電子顯微鏡、熱分析儀等測試方法，以Al粉、Ti粉、石墨粉為原料，采用燃燒合成的方法，在箱式電阻爐中整體點火引燃制備Al-Ti-C中間合金，研究Ti/C、引燃溫度、保溫時間對Al-Ti-C的影響；對制備出的Al-Ti-C進行“稀釋處理”，然后用其對工業(yè)純鋁進行細化，研究了Al-Ti-C中間合金的加入量、保溫時間對工業(yè)純鋁的細化作用，并探討細化機理；對ZL114A添加Al-Ti-C細化劑，，研究Al-Ti-C的加入量對ZL114A組織與性能的影響；對ZL114A添加稀土La，研究La的加入溫度、加入量對ZL114A組織與性能的影響。 研究表明：（1）Ti/C為6、1000℃引燃、反應后保溫5min能制備出含TiC數(shù)目多的Al-Ti-C中間合金；（2）對工業(yè)純鋁添加0.5%的Al-5Ti-0.833C合金，保溫20min能使工業(yè)純鋁全部轉(zhuǎn)化為等軸晶；（3）對ZL114A添加0.4%的Al-5Ti-0.833C，能減少ZL114A合金的二次枝晶間距，細化晶粒，提高ZL114A合金的力學性能；（4）對ZL114A添加稀土La，使La的含量為0.3%，能變質(zhì)共晶硅，減少ZL114A合金的二次枝晶間距，細化晶粒，提高ZL114A合金的力學性能。
[Abstract]:ZL114A alloy has excellent mechanical properties and casting properties, which is suitable for casting high strength castings with complex shapes and is widely used in aviation, aerospace, military and other industries. The ZL114A alloy produced in China is quite different from that in foreign countries, and some of them can not meet the requirements of aerospace and performance, so it is of great significance to improve the mechanical properties of ZL114A alloy by refinement and modification process. In this paper, using X-ray diffractometer, scanning electron microscope, thermal analyzer and other testing methods, using Al powder, Ti powder and graphite powder as raw materials, Al-Ti-C master alloy was prepared by integral ignition in box resistance furnace. The effects of Ti/C, ignition temperature and holding time on Al-Ti-C were studied. The prepared Al-Ti-C was "diluted", and then the industrial pure aluminum was refined with it, the refinement effect of the amount of Al-Ti-C master alloy and holding time on the industrial pure aluminum was studied, and the refinement mechanism was discussed, and the effect of the amount of Al-Ti-C on the microstructure and properties of ZL114A was studied by adding Al-Ti-C refiner to ZL114A. The addition temperature of La and the effect of adding amount on the microstructure and properties of ZL114A were studied by adding rare earth La, to ZL114A. The results show that: (1) Ti/C is 6, ignited at 1000 鈩

本文編號：2505263