二次固溶处理对Sb变质ZL114A合金组织性能的影响
|
摘要
Sb元素的硅相变质效果受凝固冷速影响较大。文中研究了二次固溶热处理对添加Sb元素的不同厚度阶梯试块硅相变质后微观组织与力学性能的影响。研究表明:添加0.12%Sb,初生α-Al基体平均晶粒尺寸约为164μm,共晶硅形貌呈现为细小弥散的球状相;随着凝固冷速的降低,硅相形貌逐渐转变为长棒状、针状与多边形状,硅相分布趋于富集化;二次固溶热处理改善了低凝固冷速下Sb元素的硅相变质效果,沿晶界分布的Si、Mg元素在初生α-Al基体内部不断重复溶入、析出,减小了硅相颗粒尺寸,改善了硅相形貌与分布;断口形貌由沿晶断裂逐步转变为韧窝断裂;10 mm厚度试样平均抗拉强度、屈服强度、伸长率与弹性模量分别提升为356.0 MPa、317.6 MPa、9.6%与69.6 GPa。
The modification effect of Sb element is greatly affected by the solidification cooling rate. In the present research, the effect of secondary solution heat treatment on the microstructure and mechanical properties of ZL 114 A alloy step test block with Sb addition was studied. The results showed that when Sb element was added 0.12 wt.%, the average grain size of the primary α-Al matrix was about 164 μm and the eutectic silicon phase was refined with a dispersed spherical morphology; however, with the decrease of cooling rate,the shape of eutectic silicon was transformed from spherical to long rod, needle and polygonal morphology,and the distribution tended to be concentrated. The secondary solution treatment improved the modification effect of Sb element in the low cooling rate state. Because Si and Mg elements that distributed along the grain boundary were repeatedly dissolved and precipitated in the α-Al matrix, the size of silicon particles was reduced, and the morphology and distribution were improved The fracture morphology transformed from intergranular to dimple, and the average tensile strength, yield strength, elongation and Elastic Modulus were356.0 MPa, 317.6 MPa, 9.6% and 69.6 GPa, respectively.
The modification effect of Sb element is greatly affected by the solidification cooling rate. In the present research, the effect of secondary solution heat treatment on the microstructure and mechanical properties of ZL 114 A alloy step test block with Sb addition was studied. The results showed that when Sb element was added 0.12 wt.%, the average grain size of the primary α-Al matrix was about 164 μm and the eutectic silicon phase was refined with a dispersed spherical morphology; however, with the decrease of cooling rate,the shape of eutectic silicon was transformed from spherical to long rod, needle and polygonal morphology,and the distribution tended to be concentrated. The secondary solution treatment improved the modification effect of Sb element in the low cooling rate state. Because Si and Mg elements that distributed along the grain boundary were repeatedly dissolved and precipitated in the α-Al matrix, the size of silicon particles was reduced, and the morphology and distribution were improved The fracture morphology transformed from intergranular to dimple, and the average tensile strength, yield strength, elongation and Elastic Modulus were356.0 MPa, 317.6 MPa, 9.6% and 69.6 GPa, respectively.
引文
[1]熊艳才,刘伯操.铸造铝合金现状及未来发展[J].特种铸造及有色合金,1998(4):1-5.
[2]隋育栋,王渠东.铸造耐热铝合金在发动机上的应用研究与发展[J].材料导报,2015,29(2):14-19.
[3]吴孟武,华林,周建新,等.导热铝合金及铝基复合材料的研究进展[J].材料导报,2018,32(5):1486-1495.
[4]陈康生,霍树峰.用于汽车制造工业的铸造铝合金评述[J].建筑工程技术与设计,2017(8):4922.
[5]李龙,薛喜丽,周德敬.Na变质处理对Al-10.5Si合金共晶硅尺寸及性能的影响[J].铸造,2017,66(8):854-858.
[6]张力恒,郝启堂,杨光昱.Al-4.5Ti-B细化剂和Na盐变质剂对A357合金组织和性能的影响[J].铸造技术,2007,28(2):218-222.
[7]宋丽英,刘昊昕,聂赛男,等.Sr变质对ZL101合金显微组织和低温拉伸性能的影响[J].铸造,2018,67(2):146-151.
[8]赵宇光,杨雪慧,徐晓峰,等.Al-10Sr变质剂状态、变质温度及变质时间对ZL114A合金组织的影响[J].吉林大学学报,2018,48(1):212-220.
[9]FACCOLI M,DIONI D,CECCHEL S,et al.Optimization of heat treatment of gravity cast Sr-modified B356 aluminum alloy[J].Transactions of Nonferrous Metals Society of China,2017(27):1698-1706.
[10]毛文龙,周海涛,王顺成,等.Sr变质对Al-Si-Mg合金的流动性、力学性能和导热系数的影响[J].铸造,2017,66(2):122-126.
[11]胡中潮,于慧,崔元胜,等.Sb、Te变质对ZL101合金组织和性能的影响[J].铸造,2018,67(6):502-506.
[12]申玉彬,王明星,刘志勇,等.Sb变质A356合金的组织与力学性能[J].特种铸造及有色合金,2012,32(12):1098-1102.
[13]OLE Runar Myhr,GUSTING Grong,CARMEN Schfer.An extended age-hardening model for al-mg-si alloys incorporating the roomtemperature storage and cold deformation process stages[J].Transactions of Nonferrous Metals Society of China.2017(8):1698-1706.
[14]刘金永,李磊.Sb变质对A356铝合金组织及性能的影响[J].金属加工,2013(5):46-47.
[2]隋育栋,王渠东.铸造耐热铝合金在发动机上的应用研究与发展[J].材料导报,2015,29(2):14-19.
[3]吴孟武,华林,周建新,等.导热铝合金及铝基复合材料的研究进展[J].材料导报,2018,32(5):1486-1495.
[4]陈康生,霍树峰.用于汽车制造工业的铸造铝合金评述[J].建筑工程技术与设计,2017(8):4922.
[5]李龙,薛喜丽,周德敬.Na变质处理对Al-10.5Si合金共晶硅尺寸及性能的影响[J].铸造,2017,66(8):854-858.
[6]张力恒,郝启堂,杨光昱.Al-4.5Ti-B细化剂和Na盐变质剂对A357合金组织和性能的影响[J].铸造技术,2007,28(2):218-222.
[7]宋丽英,刘昊昕,聂赛男,等.Sr变质对ZL101合金显微组织和低温拉伸性能的影响[J].铸造,2018,67(2):146-151.
[8]赵宇光,杨雪慧,徐晓峰,等.Al-10Sr变质剂状态、变质温度及变质时间对ZL114A合金组织的影响[J].吉林大学学报,2018,48(1):212-220.
[9]FACCOLI M,DIONI D,CECCHEL S,et al.Optimization of heat treatment of gravity cast Sr-modified B356 aluminum alloy[J].Transactions of Nonferrous Metals Society of China,2017(27):1698-1706.
[10]毛文龙,周海涛,王顺成,等.Sr变质对Al-Si-Mg合金的流动性、力学性能和导热系数的影响[J].铸造,2017,66(2):122-126.
[11]胡中潮,于慧,崔元胜,等.Sb、Te变质对ZL101合金组织和性能的影响[J].铸造,2018,67(6):502-506.
[12]申玉彬,王明星,刘志勇,等.Sb变质A356合金的组织与力学性能[J].特种铸造及有色合金,2012,32(12):1098-1102.
[13]OLE Runar Myhr,GUSTING Grong,CARMEN Schfer.An extended age-hardening model for al-mg-si alloys incorporating the roomtemperature storage and cold deformation process stages[J].Transactions of Nonferrous Metals Society of China.2017(8):1698-1706.
[14]刘金永,李磊.Sb变质对A356铝合金组织及性能的影响[J].金属加工,2013(5):46-47.