成形組織和性能的影響
( 東北大學(xué) 材料與冶金學(xué)院， 沈陽 110004)
摘 要: 研究了擠壓比對6201合金線材的微觀組織、 力學(xué)性能和導(dǎo)電性能的影響。 結(jié)果表明：隨著擠壓比的增大， T6態(tài)合金的強化相β′(Mg2Si)彌散質(zhì)點的尺寸減小，彌散程度增加， 合金線材的抗拉強度， 延伸率和電阻率增大， 其增大的趨勢隨著擠壓比的進一步增加而逐漸減小; 當(dāng)擠壓比一定時， 隨著在線固溶溫度與時效溫度的升高， 線材的力學(xué)性能下降，導(dǎo)電性能升高。 當(dāng)擠壓比為16.5~29.7，線固溶溫度為520~540 ℃， 時效溫度為150~160 ℃時， 合金力學(xué)性能和導(dǎo)電性能分別為： σb＝310~328 MPa， δ＝8.5%~10.3 %， ρ＝0.032 2~0.032 8 nΩ·m， 較好地滿足Al-Mg-Si導(dǎo)線標(biāo)準(zhǔn)要求。 采用合理的擠壓比， 可直接生產(chǎn)性能良好的鋁合金導(dǎo)電線材。
關(guān)鍵字: 6201鋁合金; 擠壓比; 連續(xù)擠壓; 半固態(tài); 電阻率
LI Ying-long， WANG Shun-cheng
（ School of Materials and Metallurgy， Northeastern University， Shenyang 110004， China）
Abstract:Effect of extrusion ratio on microstructures， mechanical properties and electric resistivity of 6201 alloy wire were investigated. It is shown that when the extrusion ratio increases, under T6 heat treatment state， precipitation-hardening phases β′(Mg2Si) precipitate heavily and become smaller， meanwhile， the tensile strength， elongation and electric resistivity increase. However， this increase tendency becomes moderate with further increase of extrusion ratio. For a given extrusion ratio， mechanical properties of alloy wire decrease and conductivity increases with increase of on-line solution temperature and ageing temperature. Under the conditions that the extrusion ratio is 16.5-29.7， on-line solution temperature is 520-540 ℃ and ageing temperature is 150-160 ℃， the mechanical properties and electric resistivity are σb=310-328 MPa， δ=8.5%-10.3% and ρ=0.032 2-0.032 8 nΩ·m respectively. It is satisfied for the application of Al-Mg-Si conductor wire. So fine aluminum conductor wire can be produced by the proposed process and under proper extrusion ratio.
Key words: 6201 aluminum alloy; extrusion ratio; continuous extrusion; semi-solid; resistivity
