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Steve Ooi Rebecca Reiff-Musgrove Marcus Gaiser-Porter Matthias Steinbacher Ian Griffin Jimmy Campbell Max Burley Marcus Warwick Harika Vaka Chizhou Fang Trevor William Clyne 《Advanced Engineering Materials》2023,25(10):2201512
An attraction of the profilometry-based indentation plastometry (PIP) procedure is that, while it involves interrogation of volumes sufficiently large to ensure that bulk properties are obtained, it still allows stress–strain curves to be inferred for relatively small regions, such that local properties can be mapped where they are changing over short distances. It is employed here to obtain these characteristics as a function of depth in samples that have been case hardened by the diffusional penetration of carbon, to a depth of just over a mm. This has been done for a grade of steel that is commonly treated in this way. The thickness of the layer characterized by the PIP test is around 200 μm. In addition, curvature measurements on strip samples, after incremental removal of thin layers, have been used to evaluate the (compressive) residual stresses in near-surface regions. These range up to around 200 MPa. Such stresses have only a small effect on the PIP measurements. The carburization raises the peak yield stress from the base level of around 1000 MPa to about 1400 MPa, followed by considerable work hardening. The reliability of these PIP-derived stress–strain relationships has been confirmed by comparing experimental outcomes of Vickers hardness tests with FEM predictions based on their use. 相似文献
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SiC颗粒增强铝基复合材料的钎焊性 总被引:1,自引:0,他引:1
采用氩气保护炉中钎焊和真空钎焊两种试验方法,对SiCp/101Al复合材料的钎焊性进行研究。结果表明,通过选择合理的钎料和钎剂及采用正确的钎焊工艺参数,可以实现对SiCp/101Al复合材料的钎焊连接。对获得接头进行力学性能测试,表明钎焊接头的剪切强度随钎焊温度的升高而升高,当达到一定值以后,又随着钎焊温度的升高而降低。对接头钎缝区的XRD相结构分析中发现,接头中含有Al-Cu、Al-Si共晶组织相,并且有SiC相存在,说明母材中有部分SiC增强相颗粒过渡到了钎缝之中,有利于提高钎缝接头的力学性能。从钎焊接头的断口扫描照片中可以看出,接头大部分都呈韧性断裂特征,且大多数接头都断裂于靠近钎缝的母材部位,说明钎焊接头的质量较高,钎焊工艺可行。 相似文献
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颗粒增强金属基复合材料的干摩擦性能与磨损机理 总被引:13,自引:0,他引:13
颗粒增强金属基复合材料(PMMC5)具有优良的耐磨性,在摩擦磨损领域有着广阔的应用前景。本文评述了近年来关于PMMCs干摩擦磨损行为的研究结果,从材料因素和外部条件两个角度分析了各种因素对材料耐磨性、摩擦系数和配偶件磨损的影响,总结了不同条件下复合材料的磨损机制,并提出了设计摩擦磨损性能优良的PMMCs体系的可能途径。 相似文献
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金属基复合材料残余应力测定 总被引:4,自引:0,他引:4
分析了金属基复合中热残余应力的形成机理及表现特点,并对几种常用的测定金属基复合材料残余应力的方法进行了分析比较,普通X射线法虽然简便、经济、但穿透能力有限,所测值仅反映试样表面的残余应力状态;中子衍射的区域较大,测出的仅是残余应力平均值。X射线能量衍射法虽然穿透能力较强,能测出试样内部较深范围的残余应力,但由于产生衍射法穿透力强,分辩率高,能测出复合材料内部的残余应力场梯度,是测定金属基复合材料残 相似文献
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目的突破难变形颗粒增强钛基复合材料热加工关键技术,以满足航空航天、武器装备等领域对轻量化耐高温钛基复合材料的战略需求。方法采用等温热变形技术研究颗粒增强钛基复合材料(TiB+La_2O_3/Ti)的热变形行为及微观组织演化规律,在变形温度为850~1100℃、应变速率为0.001~1 s~(-1)的条件下,建立该复合材料的本构方程及热加工图,结合微观组织演化规律分析,确定该复合材料等温热变形最佳加工工艺范围。结果增强体的加入,使钛基复合材料的流变应力和变形激活能提高,缩小了有效加工区间;材料热加工图中存在2个功率耗散率峰值区域,分别位于α+β两相区(900~950℃,0.003~0.1 s~(-1))和β单相区(1075~1100℃,0.3~1 s~(-1));在两相区易于发生连续动态再结晶,而单相区则对应于β晶粒的"项链"再结晶和片状α相的动态回复。结论该难变形复合材料等温热变形的最佳工艺范围为温度900~950℃、应变速率为0.003~0.1 s~(-1)。 相似文献
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A processing route has been developed for the fabrication of metallic fibre mat reinforced glass matrix composites. For the
model experiments reported here, a commercially available satin woven stainless steel 316L fibre mat was used as the reinforcement
and soda-lime glass as the matrix. The process involves two steps: (1) the infiltration of the intra- and inter-tows regions
of the fibre mats with silica sol using electrophoretic deposition and (2) the fabrication of a composite by cold uniaxial
pressing and pressureless sintering of impregnated fibre mats sandwiched between layers of the matrix glass powder. The sintering
took place in air at 670°C, and composite materials of sufficient integrity could be obtained without damaging the fibres.
The deposited silica remained amorphous at the processing temperature providing a porous interface between the glass matrix
and the metallic reinforcement. Obervation of fracture surfaces revealed that both fibre pull-out and fibre deformation occur,
which should lead to a significant toughness enhancement. The presence of the interfacial silica layer, deposited using electrophoresis,
is thought to be responsible for this behaviour. 相似文献