#################################################### # Judy Pang # requesting 5 days, at minimum=4 days # beamline 34ID, "Load partitioning in Ni g/g%92 single crystal under load" #################################################### # top:/home/www/beamtime-requests/req00348.txt # UNICAT Member Beam Time Request #348 # created Fri Dec 20 15:49:24 CST 2002 #################################################### beamline: 34ID collaboration: No contact: pangj@ornl.gov days: 5 description: Ni superalloy is a classic example of precipitate hardened alloy which the mechanical properties are tailored by controlling the size and distribution of the g%92 precipitates. Load partitioning between matrix phase and the precipitates plays a major role in determining the mechanical properties of the alloys. However researchers have not been able to measure the load distribution between the two phases and across their interfaces due to the lack of appropriate experimental techniques. Of equal importance to interphase load partitioning are interface stresses. They are dependent on the morphology, size and volume fraction of the precipitates. Understanding the load partitioning mechanisms will enable more reliable performance prediction of these alloys and development of alloys with more superior properties. We propose to perform a microbeam experiment on 34ID-E to determine the load partitioning of the matrix and the precipitate of a Ni superalloy single crystal as a function of plastic deformation at room temperature. Single crystal eliminates the complication of interactions of crystal anisotropy in polycrystals and the strain measurements will be a function of the interaction between the matrix and the precipitates only. The submicron beam size will also allow detailed spatial mapping of the strains across the interface. The grain size of the precipitates will be grown to about 10 mm to allow unambiguous separation of the weaker g%92 (002) superlattice peak from the g peak using monochromatic beam. Strain mapping across the interface of a two-phase alloy has never been performed before according to the proposers%92 knowledge. These measurements will demonstrate the feasibility of using x-ray microbeam to study the mechanical behavior of multi-phase alloy, which no other techniques can offer. We plan to study the load partition upon 3 deformation steps. It is estimated 1.5 days will be needed for each step and a total of 5 beam days is requested for this experiment. equipment+required: ID34-E experiment: Load partitioning in Ni g/g%92 single crystal under load foreign+nationals: Judy Pang David Dye (British) hazards: minimumdays: 4 name: Judy Pang nonmembers: David Dye, Neutron Program for Materials Research, Chalk River Laboratories, Chalk River, Canada Gene Ice, Metals %26 Ceramics Division, Oak Ridge National Labs unacceptable+dates: 1 February till 10 March #REMOTE_HOST: pangj2k.ornl.gov #REMOTE_ADDR: 160.91.156.95 #CONTENT_LENGTH: 2556 #HTTP_REFERER: http://www.uni.aps.anl.gov/unireq.htm #HTTP_USER_AGENT: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)