|
摘要：
|
|
在变形温度为350～500℃、应变速率为0.0001～1 s-1变形条件下对原位合成TiB2(质量分数8%)/6351Al复合材料进行了高温拉伸实验,并采用双曲正弦模型,确定了复合材料的常数。结果表明:流变应力峰值σP与Z参数之间能较好地满足双曲正弦关系,得到流变应力峰值σP解析表达式中常数A,α和n值分别为605.5×1012s-1,0.027MPa-1和10.018,Z参数中的激活能Q值为256.78kJ·mol-1。
|
|
The elevated temperature tensile test of in-situ TiB2(mass fraction is 8%)/6351 Al composites was carried out in the range of deformation temperature 350-500℃and strain rate 0.0001-1s-1. The material constant values were studied using a hyperbolic sine model. The results show that the hyperbolic sine can satisfactorily describe the correlation between flow stress σP and Z parameter. The values of A , α and n in the analytical expressions of flow stress σP are fitted to be 605.5×1012 s-1,0.027MPa-1 and 10.018. The hot deformation activation energy in Z parameter expression is 256.78kJ·mol-1.
|
|
基金项目：
|
|
|
|
作者简介：
|
|
|
|
参考文献：
|
[1]Lloyd D J.Particle reinforced aluminum magnesiumcompos-ites[J].International Materials Reviews,1994,39(1):1-22.
[2]Tong G Q,Chan K C.Deformation behavior of a PM Al6013/15SiCPcomposite sheet at elevated temperature[J].Materials Letters,1999,38:326-330.
[3]谭群燕,何玉松,张辉.喷射沉积7075/15SiC铝基复合材料高温拉伸变形与断裂行为[J].热加工工艺,2007,36(12):34-39.
[4]陈振华,郝亮,陈鼎,等.SiCP/FVS1012薄板微观结构及高温性能的研究[J].湖南大学学报,2007,34(11):56-60.
[5]Cavaliere P,Cerri E,Leo P.Hot deformation and processing maps of a particulate reinforced2618/Al2O3/20p metal matrix composite[J].Composites Science and Technology,2004,64:1287-1291.
[6]Cavaliere P,Cerri E,Evangelista E.Isothermal forging of AA2618+20%Al2O3by means of hot torsion and hot com-pression tests[J].Materials Science and Engineering A,2004,387-389:857-861.
[7]Vedani M,Errico F D,Gariboldi E.Mechanical and fracture behaviour of aluminium-based discontinuously reinforced com-posites at hot working temperatures[J].Composites Science and Technology,2006,66:343-349.
[8]Narayana Murty S VS,Nageswara Rao B,Kashyap B P.On the hot working characteristics of6061Al-SiCand6061-Al2O3particulate reinforced metal matrix composites[J].Compos-ites Science and Technology,2003,63:119-135.
[9]白亮,陈东,马乃恒,等.原位生成TiB2/6351复合材料的组织和性能[J].热加工工艺,2007,36(12):30-33.
[10]郭生武,吴会平,程羽,等.Co40NiCr Mo合金本构关系的建立[J].锻压技术,2008,33(1):152-157.
[11]Sellars C M,Tegart WJ M.On the mechanism of hot de-formation[J].Acta Metallurgica,1996,14(9):1136-1138.
[12]Shi H,McLaren AJ,Sellars C M,et al.Constitutive equa-tions for high temperature flow stress of aluminum alloys[J].Materials Science and Engineering A,1997,13(3):210-216.
[13]McQueen HJ,Yue S,Ryan N D,et al.Hot working char-acteristics of steels in austenitic state[J].J.Mater.Process Technol.,1995,53(1/2):293-310.
|
|
服务与反馈：
|
|
【本网站尚未开通全文下载服务】【加入收藏】
|
|
|
|
