【摘要】 研究了不同机械振动强度下制备出AlSi7Mg合金的凝固组织，随着机械振动的加强，合金的初生相平均尺寸和晶粒改性产生明显变化，初生相平均尺寸呈减小的趋势，相对应的晶粒细化程度逐渐增加。当机械振动强度分别为0、1.5、3.0、4.5和6 mm·Hz时，合金的初生相平均尺寸分别为48.99、47.06、43.75、39.12、28.67μm；合金的抗拉强度分别为158.03、165.25、170.12、176.37、186.29MPa；屈服强度分别为127.74、132.42、140.57、143.61、147.86MPa；伸长率分别为2.20%、2.48%、2.71%、3.56%、4.80%。合金的力学性能随机械振动的加强逐渐升高。更多还原

【Abstract】 The solidification microstructure of AlSi7Mg alloy prepared under different mechanical vibration frequencies was gradually enhanced with the addition of mechanical vibration and frequency, which had obvious changes in primary phase size and grain modification. With the increase of mechanical vibration intensity, the primary phase size decreased, and the grain refinement increased gradually. When the mechanical vibration intensity was 0, 1.5, 3.0, 4.5 and 6 mm·Hz, the primary phase sizes of the alloy were 48.99, 47.06, 43.75, 39.12 and 28.67 μm. The tensile strengths of the alloy were respectively 158.03, 165.25, 170.12, 176.37 and 186.29 MPa.The yield strengths were 127.74, 132.42, 140.57, 143.61 and 147.86 MPa. The elongations were 2.20%, 2.48%,2.71%, 3.56% and 4.80%, respectively. The mechanical properties of the alloys increased gradually with the addition of the mechanical vibration and the increase of the intensity.更多还原