摘要
为了进一步细化晶粒并制备均匀纳米晶,采用氢化-歧化-脱氢-重组(HDDR)技术处理球磨GZ132K镁合金粉末。通过改变温度、氢压及时间,利用正交设计,探求最佳氢化条件。随后对最佳氢化粉采用单因素控制变量,确定完全脱氢工艺。利用XRD、SEM和TEM测试手段进行相转变及组织形貌演化分析,讨论了HDDR反应及细化机理。结果表明,球磨GZ132K粉末最佳HDDR工艺参数为:在400℃,4 MPa氢压下氢化12 h,随后在450℃持续真空脱氢6 h,晶粒由初始12~76 nm细化至9 nm且大小更为均匀。同时发现,球磨GZ132K粉末的HDDR过程实际是Mg和Gd金属氢化物的化合与分解过程。
In order to further refine the grains and prepare uniform nanocrystals,the ball milled GZ132K alloy powder was treated by hydrogenation-dismutation-dehydrogenation-recombination(HDDR)technology.By changing temperature,hydrogen pressure and time,the optimum hydrogenation conditions were explored by orthogonal design.Then the optimal dehydrogenated powder was determined by single factor control variables.The phase transformation and microstructure evolution were analyzed by XRD,SEM and TEM,and the HDDR reaction and refinement mechanism were discussed.The results show that the optimal HDDR process parameters of GZ132K powder by ball milling are as follows:Hydrogenation at 400℃,4 MPa hydrogen pressure for 12 h,followed by continuous vacuum dehydrogenation at 450℃for 6 h,the grains are refined from the initial 12~76 nm to 9 nm with more uniform size.It is also found that the HDDR process of ball milling GZ132K powder is actually a combination and decomposition process of Mg and Gd metal hydride.
作者
冯欢
樊建锋
FENG Huan;FAN Jianfeng(Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《铸造技术》
CAS
2022年第6期456-461,共6页
Foundry Technology
基金
国家自然科学基金(U1710118)
山西省自然科学基金(20210302123134)
山西浙大新材料与化工研究院研发项目(2021SX-FR005)。
