Modifying Al-7Si-0.35Mg alloys using equal channel angular extrusion

作者：Chou Cheng Yu; Wang Kuan Wen; Lee Sheng Long^*; Yang Tzu Shun

来源：Materials Letters, 2008, 62(15): 2469-2472.

DOI：10.1016/j.matlet.2007.12.024

• equal channel angular extrusion
• metals and alloys
• mechanical properties

The 356 alloys which are different in the composition of Sr and Fe elements were heavily deformed by equal channel angular extrusion. The large acicular silicon in the unmodified alloy and the Fe-bearing phases act as crack initiators and provide easy paths for fracture. After extruded for 5 passes, the acicular silicon and Fe-bearing phases are obviously refined and rounded, both of which resulted in the higher values of mechanical properties. The elongation is greatly enhanced because the cracks have less opportunity to grow continuously along the boundaries of refined phases. The tensile strengths are also enhanced due to the recrystallized and finer grains.

• 出版日期2008-5-31
• 单位中央民族大学