(東北大學(xué) 材料與冶金學(xué)院， 沈陽(yáng) 110006)
摘 要: 利用自行設(shè)計(jì)的單輥剪切/冷卻（SCR）試驗(yàn)機(jī)對(duì)LY11合金進(jìn)行了半固態(tài)凝固實(shí)驗(yàn)，研究了工藝條件對(duì)LY11半固態(tài)合金組織的影響。結(jié)果表明，輥-靴間隙寬度的適當(dāng)范圍為2～3 mm；澆注溫度影響半固態(tài)合金坯料內(nèi)部晶粒的大小與形狀，澆注溫度在730～750 ℃范 圍內(nèi)，可獲得細(xì)小、均勻球狀或橢球狀晶粒組織；冷卻方式會(huì)影響半固態(tài)合金坯料晶粒的大小與分布，水冷制得的合金晶粒尺寸比空冷的小2～3個(gè)級(jí)別，而空冷制得半固態(tài)合金坯料的晶粒分布較為均勻。
關(guān)鍵字: 剪切； 半固態(tài)合金； 澆注溫度； 冷卻
semi-solid LY11 alloy during
single-roll shearing/cooling process
（Institute of Materials and Metallurgy, Northeastern University,
Shenyang 110006, P.R.China）
Abstract:A self-made single-roll shearing/cooling (SCR) machine was used to manufacture semi-solid LY11 alloy. Effect of processing factors on the micorstructures were studied. The results show that the optimum gap between roll and shoe varies in 2～3 mm; pouring temperature can affect grain size and its shape of semi-solid alloy. When cast at 730～750 ℃, fine and even grains with spherical or elliptical structures can be obtained. Cooling style can affect grain size and distribution. Grain size of alloy produced from water-cooling is 2～3 level smaller than that from air-cooling, but grains produced from air-cooling are even.
Key words: shearing； semi-solid alloy； pouring temperature； cooling
