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一、序言过去,铝及其合金的铸造宏观组织,分两类:即等轴晶和柱状晶;显微组织也分两类:即胞状组织和树枝状晶。随着铝加工工业的发展,最近发现了一种新的组织形态,即羽毛状晶。因此,将铸造宏观组织分成三类:等轴晶、柱状晶和羽毛状晶;显微组织也分为三类:胞状组织,树枝状晶和成长孪晶。羽毛状晶有许多奇特的性质。如有羽毛状晶的铸块没有宏观疏松和显微疏松(这对大规格铝合金来说是难得的);材料的性能具有明显的方向性,变形时容易流动、变形阻力小等等。因此,对于有羽毛状晶的材料的实用价值出现了两种观点。一种意见认为
First, the preamble In the past, aluminum and its alloy casting macro-organization, divided into two categories: the equiaxed and columnar crystal; microstructure is divided into two categories: the cellular structure and dendrites. With the development of aluminum processing industry, recently discovered a new organizational form, feather crystal. Therefore, the casting of macro-organization is divided into three categories: equiaxed, columnar and feather-shaped crystal; microstructure is divided into three categories: cell structure, dendrite and growth twin. Feather shaped crystal has many peculiar properties. If feathered crystal ingot is not macro-loose and microscopic loose (which is large for large-size aluminum alloy is rare); material properties have obvious directionality, easy to flow deformation, deformation resistance and so on. Therefore, two points of view have emerged regarding the practical value of a feathered crystal material. One opinion thinks