(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙，410083；
2. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙，410083)
摘 要: 采用力學(xué)性能測(cè)試、掃描電鏡、透射電鏡和能譜分析技術(shù)、切削性能測(cè)試研究固溶−時(shí)效熱處理工藝對(duì)自行研制的易切削變形Zn-10Al-1.0Cu-xBi-ySn合金擠壓態(tài)組織與性能的影響。結(jié)果表明：為獲得較佳的綜合性能，該合金較佳的熱處理工藝為(350 ℃，30 min水冷)+(100 ℃，12 h空冷)；經(jīng)過(guò)合理的熱處理后，合金中的α+η胞狀和粒狀組織增多，層片狀組織減少，合金塑性提高；熱處理后該合金的抗拉強(qiáng)度達(dá)到327.05 MPa，伸長(zhǎng)率為20.5%。
關(guān)鍵字: 易切削；變形鋅合金；固溶；時(shí)效
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:The effect of solution and aging treatment on the microstructure and properties of self-developed free-cutting deformation Zn-10Al-1.0Cu-xBi-ySn alloy were investigated by mechanical tests, optical microscopy, scanning electron microscopy, transmission electron microscope, energy spectrum analysis and machinability tests. The results show that better heat treatment process of free-cutting deformation Zn-10Al-1.0Cu-xBi-ySn alloy is (350 ℃, 30 min) with water-cooling and (100 ℃, 12 h) with air-cooling following. After a reasonable solution and aging heat treatment, the α+η cellular and granular structure of the alloy increases, the lamellar structure reduces as well, so as the plasticity of the alloy increases. And the tensile strength and elongation of the alloy are 327.05 MPa and 20.5%, respectively.
Key words: free-cutting ; deformation zinc alloy; solution; aging
