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这种“高温气体静压”处理是将铝合金铸件放置在气体加压箱内加热至接近固相线温度和向气体压力箱内泵入惰性气体(氩)而全向压缩。这时气体压力超过材料屈服极限数倍。对AЛ9和AЛ19铝合金铸件在原始状态(T7)和高温气体静压+T7状态组织的对比研究表明,经过处理后AЛ9合金中的疏松全部消失,这是因为贯通至表面的氧化膜和气孔被除掉。铸造组织中的金属间化合物成分产生球化,剩余相部分溶解而使枝晶凝聚,形成部分或完全再结晶和更完善的晶内亚结构。
This “hot gas hydrostatic” treatment involves placing an aluminum alloy casting in an autoclave heated to near solidus temperature and pumping an inert gas (argon) into the autoclave to unidirectionally compress it. At this point the gas pressure exceeds the yield limit of the material several times. Comparative studies on the microstructure of the A9 and A19 alloy castings in the as-cast state (T7) and in the high temperature gas static pressure + T7 state show that the looseness in the A9 alloy disappears after the treatment, because the oxide film and pores that penetrate to the surface are Get rid of The intermetallic compound in the cast structure is spheroidized and the remaining phase is partially dissolved to cause the dendrites to coalesce to form partially or completely recrystallized and more perfect intragranular substructures.