铸造2017，Vol.66Issue(10)：1057-1061,5.
高压凝固工艺参量对镁合金凝固组织及性能的影响
The Influence of High Pressure Solidification Process on Solidification Structure and Properties of Magnesium Alloys
摘要
Abstract
Under the action of 2-4 GPa high pressure and different heating temperature, the conventional casting of Mg-7.52Zn-2.91Y-0.54Zr was made with the CS-1B high-pressure cubic-anvil press. The effects of squeezing pressure and heating temperature on high pressure solidification microstructure and secondary dendrite arm spacing were investigated by scanning electronic microscopy (SEM) and optical microscopy (OM). The mechanical properties and corrosion resistance were measured. The results show that the as-cast microstructure of magnesium alloy can be greatly refined under high pressure. The average length of primary arm was about 165μm and the secondary arm spacing was around 35μm. When the solidification pressure was up to 2 GPa, the average size of primary was down to 50μm and the secondary arm spacing was 8μm. When the solidification pressure was up to 4 GPa, the average length of primary arm and secondary arm spacing were 20μm and 5μm respectively. The network of the second phase was gradually split and tends to become granular under the pressure of 4 GPa. The compressive strength of experimental alloy was increased from 346 MPa in conventional casting to 446 MPa under 4 GPa. In 3.5%medium of NaCl, the high pressure solidification alloy has a smaller corrosion current density and a more positive corrosion potential.关键词
高压凝固/Mg-7.52Zn-2.91Y-0.54Zr合金/二次枝晶间距/抗压强度/腐蚀电流Key words
high pressure solidification/Mg-7.52Zn-2.91Y-0.54Zr alloy/secondary dendrite arm spacing/compressive strength/corrosion current分类
矿业与冶金引用本文复制引用
刘陈,林小娉,李婵,徐畅,王涛,李泽..高压凝固工艺参量对镁合金凝固组织及性能的影响[J].铸造,2017,66(10):1057-1061,5.基金项目
国家自然科学基金资助(51775099,51675092) （51775099,51675092）
河北省自然科学基金项目(E2014501123). （E2014501123）
