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本文对比研究了一种新型活塞用B型铝合金与ZL109的组织与力学性能.研究表明,ZL109的组织由Al,Si,Al6Mn和Al5Fe Ni的相组成,B型铝合金由Al,Si,Al6Mn,Al2Cu,Al1.9Cu Mg4.1Si3.3(Q相),Al Ni Cu和更多的Al5Fe Ni组成;源于B型铝合金中的α铁相呈现鱼骨状和块状,减轻了ZL109组织中针片状β铁相对基体的割裂作用,La和Ce元素的Al Ni Cu相高温下可起到阻碍晶界滑动和阻碍基体变形的作用,并且组织中还生成了Al2Cu,Al5Fe Ni和Al1.9Cu Mg4.1Si3.3强化相;因而,B型铝合金的力学性能优于ZL109,且受活塞缸径尺寸规格的影响较小;B型铝合金的断裂类型为准解理断裂,呈现韧窝、舌状花样以及撕裂棱特征.
This paper comparatively studies the microstructure and mechanical properties of a new type of aluminum alloy for piston B and ZL109.The results show that the microstructure of ZL109 consists of Al, Si, Al6Mn and Al5Fe Ni phases, and the B type aluminum alloy consists of Al, Si, Al6Mn , Al2Cu, Al1.9CuMg4.1Si3.3 (Q phase), AlNiCu and more Al5FeNi. The α-Fe phase originating from the B-type aluminum alloy showed fish bone and lump shape, which reduced the structure of ZL109 The segmented action of medium-sized flake β-iron relative to the matrix, the Al Ni Cu phase of La and Ce elements can prevent the grain boundary from sliding and hinder the deformation of the matrix at high temperature, and Al 2 Cu, Al 5 Fe Ni and Al 1 are also formed in the microstructure. 9Cu Mg4.1Si3.3 reinforced phase; therefore, the mechanical properties of B-type aluminum alloy is better than ZL109, and piston bore size specifications of small impact; B-type aluminum alloy fracture type quasi-cleavage fracture, showing dimples, Tongue pattern and tear edge features.