Liu Lehua, Zhang Tao, Liu Zhiyuan, Yu Chunyan, Dong Xixi, He Liangju, Gao Kuan, Zhu Xuguang, Li Wenhao, Wang Chengyong, Li Peijie, Zhang Laichang, Li Lugee
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
Institute of Manufacturing Technology, Guangdong University of Technology, Guangzhou 510000, China.
Materials (Basel). 2018 Nov 21;11(11):2338. doi: 10.3390/ma11112338.
Forming complex geometries using the casting process is a big challenge for bulk metallic glasses (BMGs), because of a lack of time of the window for shaping under the required high cooling rate. In this work, we open an approach named the "entire process vacuum high pressure die casting" (EPV-HPDC), which delivers the ability to fill die with molten metal in milliseconds, and create solidification under high pressure. Based on this process, various Zr-based BMGs were prepared by using industrial grade raw material. The results indicate that the EPV-HPDC process is feasible to produce a glassy structure for most Zr-based BMGs, with a size of 3 mm × 10 mm and with a high strength. In addition, it has been found that EPV-HPDC process allows complex industrial BMG parts, some of which are hard to be formed by any other metal processes, to be net shaped precisely. The BMG components prepared by the EVP-HPDC process possess the advantages of dimensional accuracy, efficiency, and cost compared with the ones formed by other methods. The EVP-HPDC process paves the way for the large-scale application of BMGs.
由于在所需的高冷却速率下缺乏成型的时间窗口，利用铸造工艺形成复杂几何形状对大块金属玻璃（BMGs）来说是一项巨大挑战。在这项工作中，我们开创了一种名为“全过程真空高压压铸”（EPV-HPDC）的方法，该方法能够在数毫秒内用熔融金属填充模具，并在高压下实现凝固。基于此工艺，使用工业级原材料制备了各种锆基BMGs。结果表明，EPV-HPDC工艺对于大多数尺寸为3毫米×10毫米且具有高强度的锆基BMGs来说，是可行的制备玻璃态结构的方法。此外，已经发现EPV-HPDC工艺能够精确地实现复杂工业BMG零件的净成型，其中一些零件很难通过任何其他金属工艺成型。与通过其他方法成型的零件相比，通过EVP-HPDC工艺制备的BMG零件具有尺寸精度高、效率高和成本低的优点。EVP-HPDC工艺为BMGs的大规模应用铺平了道路。
