摘要
试验熔制了Mg-12%Li-1%Al合金,研究了添加少量的CaF2对合金组织和性能的影响。通过显微观察可知,被还原元素Ca对显微组织中的β相(bcc)有细化作用,Ca主要富集在晶界处,合金中的晶界网格为Ca和Al的富集物,为Al2Ca化合物。显微组织细化机理可以认为,由于Ca在晶界处的吸附作用极大的抑制了晶粒的长大而使其细化。室温下进行轧制板材拉伸测试,结果表明,置换出来的元素Ca可以提高合金的强度和塑性。
Mg-12% Li-1% Al alloys were prepared and the effects of small quantity of CaF2 additive on the microstructures and mechanical properties of the as-obtained alloys were studied. By observing the microstructures of the alloys, it was found that the reduced element Ca resulted in refinement of the β （bcc） phase, Ca enriched on the grain boundaries, which resulted in the formation of Al2Ca chemical. According to the refinement mechanism, grain growth was inhibited significantly due to the absorption of Ca on the grain boundaries, which leaded to grain refinement. Mechanical tests were carried out at room temperature. The results showed that tensile strength and elongation percentage were enhanced by the replaced element Ca.
出处
《矿冶工程》
CAS
CSCD
北大核心
2007年第2期81-83,共3页
Mining and Metallurgical Engineering
基金
湖南省重大专项(057K1006-1)
